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CRPL-F45 National Bureau of Standards
Library, N. W. Bldg.
MAY 2 6 1948
Reference book not to be taken from the Library.
IONOSPHERIC DATA
ISSUED
MAY 1948
PREPARED BY CENTRAL RADIO PROPAGATION LABORATORY National Bureau of Standards
Washington, D.C.
•»
CRPL-F45 CENTRAL RADIO PROPAGATION LABORATORY Issued NATIONAL BUREAU OF STANDARDS 24 May, 1948
WASHINGTON, D.C.
IONOSPHERIC DATA
CONTENTS Page
Terminology and Scaling Practices . 2
Monthly Average and Median Values of World-Wide Ionospheric Data.4
Ionospheric Data for Every Day and Hour at Washington, D. C.7
Ionosphere Disturbances . ......... 7
Solar Coronal Intensities Observed at Climax, Colorado 8
ii
American and Zurich Provisional Relative Sunspot Numbers ...................... 9
Erratum......'..9
Tables of Ionospheric Data .............. 10
Graphs of Ionospheric Data ....... . 45
Index of Tables and Graphs of Ionospheric Data in CRPL-F45 . ...... 76
2
TERMINOLOGY AND SCALING PRACTICES
The symbols and terminology used in this report are those adopted by
the International Radio Propagation Conference, and given in detail on
pages 24 to 26 of the report IRPL-C61, "Report of International Radio Pro¬ pagation Conference," and in the section on "Terminology" in report IRPL-F5.
Beginning with IRPL-F14 the symbol L, defined as follows, is used in
detailed tabulations of hourly values of ionosphere characteristics observed at Washington:
L or 1 = critical frequency, muf, or muf factor for FI layer omitted because no definite and abrupt change in slope of the h'f curve occurs either for the first reflection or for any of
the multiples.
In the past, ionospheric conditions were summarized on a monthly basis by using average or mean values for each hour of the day for each month. However, following the recommendations of the International1 Radio Propagation
Conference, held in 'Washington April 17 to May 5, 1944* beginning with data for January 1, 1945, median values are published wherever possible.
Where averages are, reported, they are, at any hour, the average for all the days during the month for which numerical data exist.
The monthly median values used here are the values equaled or exceeded on half the days of the month at the given hour. The following conventions
are used in determining the medians for hours when no measured values are given because of equipment limitations and ionospheric irregularities.
Symbols used are those given in the report referred to above, IRPL-C61.
a. For all ionospheric characteristics: Values missing because of A, B, C, or F (see terminology
referred to above) are omitted from the median count.
b» For critical frequencies and virtual heights: Values of f°F2 (and f°E near sunrise and sunset) missing
because of E are counted as equal to or less than the lower limit of the recorder. Values of h’F2 (and h'E near sunrise and sunset) missing for this reason are counted as equal to or greater than the median. Other characteristics missing because of E are omitted from the median count. See CRPL-F38, page 9.
Values missing because of D are counted as equal to or greater than the upper limit of the recorder.
Values missing because of G are counted: 1. For f°F2, as equal to or less than f°Fl. 2. For h’F2, as equal to or greater than the median.
Values missing for any other reason are omitted from the median count.
3
c. For muf factors (l.!-factors): Values missing because of G are counted as equal to or
less than the median. Values missing for any other reason are omitted from the
median count.
d. For sporadic E (Es):
Values of fEs missing because no Es reflections appeared, the equipment functioning normally othervdse, are counted as equal to or less than the median f°E, or equal to or lees
than the lower frequency count of the recorder. Values of fEs missing for any other reason, and values of
hEs missing for any reason at all are omitted from the median . count.
Beginning with data for November 1945, doubtful monthly median values for ionospheric observations at Washington, D. C», are indicated by paren¬ theses, in accordance with the practice already in use for doubtful hourly values. The following are the conventions used to determine whether or not a median value is doubtful:
1. If only four values or less are available, the data are considered insufficient and no median value is computed.
2. For the F2 layer, if only five to nine values are available, the median is considered doubtful. The E and FI layers are eo regular in their characteristics that, as long as there are at least five values, the median is not considered doubtful.
3. For all layers, if more than half of the values used to compute the median are doubtful (either doubtful or interpolated), the median is considered doubtful.
The same conventions are used by the CRPL in computing the medians from tabulations of daily and hourly data for stations other than Washington, beginning with the tables in IRPL-F18.
Beginning with CRPL-F33, an additional group of symbols is used in recording the Washington, D.C. data. The list of additional symbols and
their meanings follov/s:
N - unable to make logical interpretation. P - trace extrapolated to a critical frequency. Q - the FI layer not present as a distinct layer. R - curve becomes incoherent near the F2 critical frequency. S - no observation obtainable because of interference. V - forked record (previously denoted by U. This change
should also be made in CRPL-7-1). Z - triple split near critical frequency.
For a more detailed explanation of the meaning and use of these symbols,
see the report CRPL-7-1, "Preliminary Instructions for Obtaining and Reducing
Manual Ionospheric Records."
4
MONTHLY AVERAGE AND MEDIAN VALUES OF
WORLD-WIDE IONOSPHERIC DATA
The ionospheric data given here in tables 1 to 59 and figures 1 to
121 were assembled by the Central Radio Propagation Laboratory for analysis
and correlation, incidental to CRPL predictions of radio propagation con¬
ditions. The data are median values unless otherwise indicated. The
following are the sources of the data;
Australian Council for Scientific and Industrial Research,
Radio Research Board;
Brisbane, Australia
Canberra, Australia
Hobart, Tasmania
Townsville, Australia
Australian Department of Supply and Shipping, Bureau of Mineral Resources, Geophysical Section:
Watheroo, 71. Australia
British Department of Scientific and Industrial Research,
Radio Research Board:
Slough, England
Falkland Is.
Canadian Radio ?/ave Propagation Committee:
Churchill, Canada
Clyde, Baffin I.
Ottawa, Canada
Portage la Prairie, Canada
Prince Rupert, Canada
St. John's, Newfoundland
New Zealand Radio Research Committee:
Campbell I.
Christchurch, New Zealand (Canterbury University College Observatory) Fiji Is.
Rarotonga I.
South African Council for Scientific and Industrial Research:
Johannesburg, Union of S. Africa
Scientific Research Institute of Terrestrial Magnetism, Moscow, U.S.S.R.: Alma Ata, U.S.S.R. Bay Tiksey, U.S.S.R.
Bukhta Tikhaya, U.S.S.R. Chita, U.S.S.R.
Leningrad, U.S.S.R. Moscow, U.S.S.R.
Sverdlovsk, U.S.S.R.
Tomsk, U.S.S.R.
Japanese Physical Institute for Radio ?/aves (under supervision of Supreme Commander, Allied Powers):
Fukaura, Japan Shibata, Japan Tokyo (Kokobunji), Japan Wakkanai, Japan Yamakawa, Japan
United States Army Signal Corps: Adak, Alaska Okinawa I.
National Bureau of Standards (Central Radio Propagation Laboratory): Baton Rouge, Louisiana (Louisiana State University) Boston, Massachusetts (Harvard University) Fairbanks, Alaska (University of Alaska, College, Alaska) Guam I. Huancayo, Peru (Instituto Geofisico d® Huancayo) Maui, Hawaii Palmyra I. San Francisco, California (Stanford University) San Juan, Puerto Rico (University of Puerto Rico) Trinidad, British Rest Indies Washington, D. C. White Sands, New Mexico Wuchang, China (National Wuhan University)
All India Radio (Government of India), New Delhi, India: Bombay, India Delhi, India Madras, India
Indian Council of Scientific and Industrial Research, Radio Research Committee:
Calcutta, India
Radio Wave Research Laboratory, Central Broadcasting Administration: Chungking, China Lanchow, China Nanking, China Peiping, China
French Ministry of Naval Armaments (Section for Scientific Research) Fribourg, Germany
National Laboratory of Radio-Electricity (French Ionospheric Bureau) Bagneux, France
Philippine Republic, Radio Control Division, Department of Commerce and Industry:
Leyte, Philippine Is,
Norwegian Defense Research Establishment., Florida, Bergen, Norway: Tromso, Norway
6
Beginning with CRPL-F26, publication of tables of so-called "provi¬
sional data" reported to the CRPL by telephone or telegraph was discontinued.
The reason for this change in policy is that users of the data hitherto
published in this form receive them through established channels sooner
than through the F series. Furthermore, having two sets of data, "provi¬
sional" and "final," for the same station for the same month leads to
confusion.
It must be emphasized that no change has been made in the methods
used for rapid reporting and exchange of data. The change has to do only
with the -printing of provisional data in the F series.
The tables and graphs of ionospheric data are correct for the values
reported to the CRPL, but, because of variations in practice in the inter¬
pretation of records and scaling and manner of reporting of values, may at times give an erroneous conception of typical .ionospheric character¬
istics at the station. Some of these errors are due to:
a. Differences in scaling records when spread echoes ere present.
b. Omission of values when f°F2 is less than or equal to f°Fl,
leading to erroneously high values of monthly averages or
median values.
c. Omission of values when critical frequencies are less than the lower frequency limit of the recorder, also leading to erron¬
eously high values of monthly average or median values.
These effects were discussed on pages 6 and 7 of the previous F-series
report IRPL-F5.
The dashed-line prediction curves of the graphs of ionospheric data
are obtained from the predicted zero-muf contour chart's of the CRPL-D
series publications. Predictions for individual stations used to con¬
struct the charts may be more accurate than the values read from the
charts since some smoothing of the contours is necessary to allow for
the longitude effect within a zone. The final presentation is dependent
uron the latest available ionospheric and radio propagation data, as
well as upon predicted sunspot number. The following predicted sncothed
12-month running-average Zdrich sunspot numbers were used in constructing
the contour charts:
L'onth Predicted Sunspot No.
1948 19Z.7 1946 1945 December 126 85 38 November 124 83 36
October 119 81 23 September 121 79 22 August 122 77 20 July 116 73 June 112 67 May 109 67 April 133 107 62
Mar ch 133 105 51 February 133 90 46 January 130 88 42
7
IONOSPHERIC DATA FOR EVERY DAY AND HOUR
AT WASHINGTON, D. C
The data given in tables 60 to 71 follow -the scaling practices given
in the report IRPL-C61, "Report of International Radio Propagation Con¬
ference/1 pages 36 to 39, and the median values are determined by the
conventions given above under "Terminology and Scaling Practices,"
IONOSPHERE DISTURBANCES
Table 72 presents ionosphere character figures for Washington, D.C., during April 1945, as determined by the criteria presented in the report
IRPL-R5, "Criteria for Ionospheric Storminess," together with Cheltenham,
Maryland, geomagnetic K-figures, which are usually covariant with them.
Table 73 lists for the stations whose locations are given the sudden
ionosphere disturbances observed on the continuous field intensity re¬
cordings made at the Sterling Radio Propagation Laboratory during April
1948.
Table 74 lists for the stations 7/hose locations are given th® sudden
ionosphere disturbances observed at the Point , Californias receiving station of RCA Communications, Inc,, from April 7 to April 17, 1.48.
Table 75 lists for the stations '..hose local:! . . . ar given the sudden
ionosphere disturbances observed at the Platan sntina, receiving station of the. International Telepho a end T icration from
March 11 to April 21, 1948,
Table 76 lists for the stations whose locations are given the sudden ionosphere disturbances observed at the Brentwood and Somerton, England,
receiving stations of Cable and Wireless, Ltd,, from March 19 through
April 20, 1948,
Table 77 gives provisional radio propagation quality figures for the
North Atlantic and North Pacific areas, for 01 to 12 and 13 to 24 GOT,
March 1948, compared with the CRPL daily radio disturbance warnir
which are primarily for the North Atlantic paths, the CRPL weekly radio
propagation forecasts of probable disturbed periods, and the half-day Cheltenham, Maryland, geomagnetic K-figures,
The radio propagation quality figures are prepared from radio traffic
and ionospheric data reported to the CRPL, in a manner basically the same
as that described in IRPL-R31, "North Atlantic. Radio Propagation Disturb¬
ances, October 1943 through October 1945," issued February 1, 1946. The
scale conversions for each report are revised for use with the data be¬
ginning January 1948, and statistical weighting replaces what was, in
effect, subjective weighting. Separate master distribution curves of the
8
tyne described in IRPL-R31 were derived for the part of 1946 covered by
each report; data received only since 1°46 are compared with the master
curve for the period of the available data. A report whose distribution
is the sane as the master is thereby converted linearly to the Q-figure
scale. Each report is given a statistical weight which is the reciprocal
of the departure from linearity. The half-daily radio propagation quality
figure, beginning January 194?-, is the weighted mean of the reports re¬
ceived for that period.
These radio propagation quality figures give a consensus of opinion
of actual radio propagation conditions as reported by the half day over
the two general areas. It should be borne in mind, however, that though
the quality may be disturbed according to the CRPL scale, the cause of the
disturbance is not necessarily known. There are nan2/ variables that must
be considered. In addition to ionospheric storminess itself as the cause,
conditions may be reported as disturbed because of seasonal characteristics,
such as are particularly evident in the pronounced day and night contrast
over North Pacific paths during the winter months, or because of improper
frequency usage for the path and time of day in question. Insofar as
possible, frequency usage is included in rating the reports. Where the
actual frequency is not shown in the report to the CRPL, it has been
assumed that the report is made on the use of optimum working frequencies
for the path arid time of day in question, fince there is a possibility
that all the disturbance shown by the quality figures is not due to iono¬
spheric storminess alone, care should be taken in using the quality figures
in research correlations with solar, auroral, geomagnetic, or other data.
Nevertheless, these quality figures do reflect a consensus of opinion of
actual radio propagation conditions as found on any one half day in either
of the two general areas.
SOLAR CORONAL INTENSITIES OBSERVED
AT CLIMAX, COLORADO
In tables 78a and 7?b are listed the intensities of the green (5303A)
line of the emission spectrum of the solar corona as observed during April
194? by the High Altitude Observatory of Harvard University and the Univ¬
ersity of Colorado at Climax, Colorado, for east and west limbs, respective¬
ly, at 5° intervals of position angle north and south of the solar equator
at the limb computed to the nearest 5°. A correction, P, as listed, has
been applied to the position angles of the actual observations which were
on astronomical coordinates. The time of observation is given to the
nearest tenth of a day, GCT. The tables of coronal observations in
CRFL-F29 to F41 listed the data on astronomical coordinates; the present format on solar rotation coordinates is in conformity with the tables of
CRPL-1-4, "Observations of the Solar Corona at Climax, 1944“46."
9
Tables 79a and 79b give similarly the intensities of the first red
(6374A) coronal line; tables FOa and FOb list the intensities of the second
red (6704A) coronal line. The following symbols are used in tables 7F, 79,
and FO: a, observation of low weight; corona not visible; and x, position-
angle not included in plate estimates.
AMERICAN AND ZURICH PROVISIONAL RELATIVE
SUNSPOT NUMBERS
Table FI presents the daily American relative sunspot number, R&,
computed from observations communicated to CRPL by observers in America
and abroad. Beginning with the observations for January 194f, a new method of reduction of observations is employed such that each observer is assigned
a scale-determining "observatory coefficient," ultimately referred to Zurich
observations in a standard period, December 1944 to September 1945, and a statistical weight, the reciprocal of the variance of the observatory
coefficient. The daily numbers listed in the table are the weighted means
of all observations received for each day. Details of the procedure will
be published shortly. The American relative sunspot number computed in
this way is designated R^. It is noted that a number of observatories
abroad, including the Zurich observatory, are included in . The scale of
R^ was referred specifically to that of the Zurich relative sunspot numbers
in the standard comparison period; since that tine, R4 is influenced by the
Zurich observations onU/ in that Zurich proves to be a consistent observer
and receives a high statistical weight. In addition, this table lists the
daily provisional Zurich sunspot numbers, Rg.
ERRATUM
1. CRPL-F/3, P,. 441, table F7, and CRPL-F44, P. 42, table FO, under "Symbols," opposite "G": Change 3 to 5.
10 TABLES OF IONOSPHERIC DATA
Table 1
Washington, D. C. (39.0°N, 77.5°^) A7rii ^
Time: 75.0°W. Sweep: 1.0 Me to 25.0 Me in 15 seconds.
Table 3
adak, Alaska (51.9°N, 176.6°W) March 1948
Time h'F2 f°F2 h'Fl f°Fl h'E f°E fEs F2-M3000
00 320 3.8 2.7 01 320 3.8 2.6 03 320 3.8 3.7 03 320 3.8 2.6' 04 310 3.8 2.6 05 310 3.6 2.6 06 260 5.0 145 1.8 2.8 07 230 6.8 230 130 2.4 3.2 08 230 8.6 220 3.8 120 2.9 3.2 09 230 9.7 210 4.0 120 3.2 3.2 10 230 10.6 210 4.2 120 3.4 3.1 11 240 11.2 210 4.3 120 3.5 3.1 12 230 11.5 210 4.4 110 3.6 3.2 13 240 11.5 215 4.4 120 3.5 3.1 14 230 11.2 220 4.2 130 3.4 3.1 15 230 10.8 220 4.2 120 3.2 3.2 16 230 10.3 220 3.6 130 2.9 3.2 17 220 9.4 120 2.4 3.3 18 220 8.6 140 1.8 3.3 19 220 7.5 3.2 20 220 6.2 3.2 21 230 5.0 3.1 22 260 4.3 3.9 23 390 3.9 2.8
Time: 180.0°W. Sweep: 1.2 Me to 15.5 Me in 12 minutes, manual operation.
Table 2
Fairbanks, Alaska (64*. 9°N, 147.8 W) March 1948
(9
Time: 150.0°*. Sweep: 16.0 Me to 0.5 Me in fifteen minutes, automatic operation.
Table^ 4
Boston. Massachusetts (42.4°N, 71.2°W) March 1948
Sweep: 0.8 Me to 14.0 Me in 1 minute.
’alle Tulle 6
• Time! 120.0°W. Sweep: 1.3 Me to 18.5 Me in 4 minutes 30 seconds.
Table 7
Baton Eou^e, Louisiana (30.5°N, 91.2°V) March 1948
Time h'F2 f°F2 h'Fl f°Fl h'S f°E fEa F2-1B000
00 290 5.8 2.9
01 290 5.7 2.8
02 290 5.5 2.9
03 290 5.1 2.9 .
04 290 4.7 2.8
05 300 4.4 2.8
06 290 5.4 2.9 07 270 8.0 130 2.3 3.2
08 280 9.9 230 120 3.0 3.1
09 290 1C.8 220 120 3.4 3.0
1C 2S0 11.3 220 (5.0) 120 3.6 2.9
11 300 12.0 220 (5.2) 120 3.7 2.9
12 300 12.2 (225) (5.3) 120 (3.7) 2.9 13 310 12.2 (230) (5.4) 120 3.7 2.9 14 300 12.2 230 (5.2) 120 3.7 2.9
15 310 12 .2 240 120 3.5 2.8
16 295 12.0 250 120 3.2 2.9 17 280 11.8 250 120 2.7 2.9
18 250 10.6 3.0
19 230 9.0 3.0
20 240 7.6 3.0 21 280 6.8 2.9 22 280 6.5 2.9 23 280 6.1 2.9
Time: 90.0°tf. Sweep: 2.15 Me to 18.5 Me in 5 minutes, automatic operation.
White Sands, New Mexico (32.3°N, 106.5°W) March 1948
Sweep: 0.79 Me to 14.0 Me in 2 minutes.
Table T
Maui, Hawaii (20.8°N, 156.5°W) March 1948
Sweep: 2.2 Me to 16.0 Me in 1 minute; above 16.0 Me, manual operation.
Table 9
San Juan, Puerto Rico (18.4°N, 66.1°W) March 1948
Timel 60.0°W.
Sweep: 2.8 Me to 13.0 Me in 9 minutoe, eupplemented by manual operation.
Guam i . (13.6°H 144.9nSi)
Table 10
March 1948
Time h'F2 , f°F2 h'Fl f°Fl h'E f°B fEs F2-M3000
00 330 (11.8) 3.8 (3.1)
01 330 12.5 2.5 3.3
03 .336 11.2 3.3 3.3
03 330 7o9 1.7 3.3
04 230 6.7 3.3
06 340 6.8 2.8 3.3
06 340 5.0 3.1 3.1
07 260 8.1 3.4 3.1 .
08 340 11.0 5.0 3,1
09 330 12.2 5.1 3.8
10 330 13.0 5.0 2.4
11 210 13.7 6.0 3.4
13 310 12.6 5.0 2.3
13 200 13.3 5.3 3.4
14 300 12.7 5.2 2.4
15 315 13.5 6.0 3.6
16 330 14.3 4.8 3.5
17 340 14.6 4.8 2.5
18 360 14.1 4.3 3.5
19 315 13.7 2.5 2.3
30 365 (13.0) 1.9 (3.2)
31 396
33 2-40 (13.0) 3.3 (2.7) 23 230 (13.2) 3.5 (2.8)
Timei 150.0°E. Sweep: 1.25 Mo to 19.0 Me in 12 minutoe, manual operation.
Table 11 Table 12
Trinidad, Brit.West Indies (10.6°N, 61.3°W) March 1948 Palmyra I. (5.9°H, 162.1°H) March 1948
Time h'F2 f°F2 h'FI f°Fl h'E f°E fEs F2-M3000 Time h'F2 f°F2 h'Fl f°Fl h'E f°E fEs fo
o
o
o
00 240 10.6 3.1 00 240 12.3 3.0 3.1 01 220 9.4 3.3 01 230 (10.3) 2.7 (3.1) 02 210 7.2 3.2 03 240 (8.3) 2.1 (3.0) 03 210 5.5 3.2 03 250 •(7.4) 2.7 (3.0) 04 225 3.8 3.0 04 250 (6.3) 2.7 (3.0) 05 270 3.5 2.8 05 350 (6.5) 2.9 (2.9) 06 270 4.3 2.9 06 250 5.6 3.0 2.9 07 230 7.9 120 2.2 2.6 3.3 07 370 8.5 130 2.3 3.4 2.9
22 U 10.1 100 3.0 3.4 3.1 08 250 10.7 ISO 3.0 3.5 2.7 09 250 11.8 220 5.0 100 3.5 4.0 3.0 09 240 11.9 230 130 3.5 2.5 1 10 260 12.5 220 5.1 100 3.8 4.3 3.0 10 380 11.8 220 130 3.7 2.4 11 270 13.3 200 5.4 100 3.9 4.4 2.9 11 300 11.5 220 5.0 120 4.0 2.3 12 270 13.4 200 5.5 110 4.0 4.6 3.9 13 310 11.5 220 5.3 120 (4.0) 2.3
280 13.8 220 5.4 105 4.0 4.5 3.9 13 300 11.8 200 5.0 120 4.0 2.3 14 280 13.6 220 5.2 100 3.9 4.6 2. 9 14 300 12.3 330 4.9 120 '3.8 2.3 15 270 13.2 220 5.0 110 3.7 4.6 2. 8 15 360 12.9 200 4.3 130 3.6 2.4 16 270 12.9 220 (4.6) 100 3.4 4.3 2.8 IE 250 13.6 230 3.7 120 3.3 2.4 17 240 12 .8 220 (4.1) 110 2.9 3.7 2.8 17 250 14.0 120 2.9 3.6 2.5 18 250 12.4 120 2.0 2.8 2.9 18 380 14.0 140 2.2 3.6 2.5 19 250 11.7 2.4 2.8 19 325 13.7 3.0 2.4 20 250 11.6 2.8 30 370 (13.0) 1.7 (2.2)’ 21 240 11.4 2.9 31 300 14.3 2.1 (2.5) 22 250 11.0 2.9 22 250 (14.4) 3.0 (2.6) 23 250 10.8 2.9 23 240 12.8 3.5 (2.9)
Time*. 6n'° Time: 157.5°W. Sweep! 1.2 Me to 18.0 Me, manual operation. Sweep! 1.0 Me to 13.0 Me in 1 minute 36 seconds, automatic operation;
13.0 Me to 18.0 Me, manual operation.
Table 13 Table 1/ 13
Clyde, Baffin I. (70.5°H, 68.6°b) February 1948
Sweep: 2.2 Me to 16.0 Me in 1 minute; 1.9 Me to 13.0 Me, manual operation.
Table 15
Prince Eupert, Canada (54.3°!!. 130.3°W) February 1948
Time: 120.0°W.
Sweep: 1.6 Me to 13.5 Me, manual operation.
Churchill, Canada (58.8°H, 94.2^W) February 1948
lime: 90.0°W.
Sweep: 2.2 Me to 16.0 Me in 1 minute.
Table lfc
Portage la Prairie, Canada (49.9°H, 98.3°W) February 1948
Time: 90.0°W.
Sweep: 1.0 Me to 16.0 Me in 2 minutes 30 seconds.
14 ’able 17 Table If
St. John's, Newfoundland (47.6°N, 52.7°W)' February 1948 Ottawa, Canada (45.fi°N, 75.8°W) February 1948
Time h'F2 f°F2 h'Fl f°Fl h'E r°E fEs F2-M3000
00 290 3.3 3.0 01 290 3.6 3.1
02 300 3.6 3.1 03 290 3.4 3.1 04 280 3.1 3.1 05 280 2.9 3.2 06 270 3.3 3.2 07 250 4.6 3.2 08 230 7.0 120 2.2 1.6 3.2 09 230 8.7 230 3.8 120 2.8 3.1 10 230 9.9 220 4.4 120 3.1 3.1 11 260 10.8 220 4.6 120 3.2 3.1 12 260 11.0 220 4.6 120 3.3 3.1 13 260 11.0 220 4.6 120 3.4 3.0 14 250 11.0 220 4.4 120 3.3 3.0 15 240 10.9 230 4.2 120 3.0 3.1 16 230 10.7 230 3.9 120 2.7 3.1 17 230 10.1 120 2.2 3.1 18 230 9.5 3.0 19 240 8.0 3.0 20 240 7.0 2.9 21 250 6.0 2.9 22 270 5.4 3.0 23 280 3.6 3.1
Time: 52.5°W. Sweep: . 1.3 Me to 30.0 Me, manual operation.
f°F2 h'Fl f°Fl Time. h'F2 h'E X£E£Ea Fg-Sam
00 4.2
01 4.3
02 3.5
03 3.2
04 3.6
05 3.4
06 3.5
07 4.7
08 6.7
09 8.9
10 9.8
11 10.9
12 11.3
13 11.2
14 11.2
15 11.0
16 10.8 17 10.2
18 9.5
19 8.5
20 7.0
21 6.0 22 5.2
23 4.5
2.2 2.7
4.0 3.0 4.3 3.2
4.5 3.3
4.3 3.2 4.2 3.1 3.9 2.9 3.6 2.5
2.2
Time: 75.0°W. Sweep: 1.7 Me to 18.0 Me, manual operation.
Table 19 Table 20
Huancayo, Peru (12.0°S, 75.3°W) February 1948 Johanneeburg, Union of S. Africa (26.2°3, 28.0°K) February 1948
Time: 75.0°W.
Sweep. 16.0 Me to 0,5 Me in 15 minutes, automatic operation.
Time h'F2 f°F2 h'Fl f°Fl h'E f°E fEs F2-mOOO
00 260 5.7 2.9 01 270 5.3 2.9 02 260 4.9 2.9 03 270 4.6 2.9 04 (270) 4.3 2.9 05 (270) 4.0 2.9 06 250 5.5 3.1 07 240 7.5 230 110 2.6 3.3 3.2 08 250 8.9 220 100 3.2 4.0 3.0 09 280 9.8 210 5.4 100 3.5 2.9 10 310 10.6 200 5.5 100 3.8 4.0 2.8 ii 310 11.3 205 5.5 100 4.0 2.8 12 310 11.6 200 5.5 100 4.0 2.8 13 320 11.8 200 5.5 100 (4.0) 2.8 14 320 11.6 210 5.5 100 ‘3.9 2.8 15 33 0 11.5 210 5.3 100 3.7 2.8 16 290 11.0 220 5.0 100 3.5 4.0 2.8 17 260 10.5 230 110 3.1 3.9 2.9 18 240 10.1 110 2.3 3.3 2.9 19 230 9.8 2.4 2.9 20 230 8.6 2.3 2.9 21 240 7.8 3.0 22 250 6.7 3.0 23 250 6.1* 2.9
Time: 30.0°E. Sweep: 2.0 Me to 15.0 Me in 8 seconds.
;
Table 21
15
Christchurch, New Zealand (43.5°3, 172.7°E) February 1940
Time h'F2 f°F2 h'Fl f°Fl ” f°E fEs F2-;.nooo
00 300 7.5 3.5 2.6
01 300 7.1 2.9 2.6
02 290 6.6 2.9 2.6
03 280 6.0 2.8 2.6
04 280 5.6 2.8 2.7
05 270 5.3 (1.3) 2.7 2.8
06 255 5.9 2.0 2.8 3.0
07 250 7.0 4.2 2.7 4.5 3.0
08 200 7.8 230 4.9 3.1 5.1 3.0 09 310 8.3 240 5.3 3.4 5.2 2.9 10 300 8.6 220 5.2 3.6 5.3 3.0 11 320 9.0 225 5.5 3.7 5.0 2.9 12 320 9.0 220 5.5 3.8 4.1 2.8 13 325 8.8 230 5.6 3.8 2.8 14 330 8.8 220 5.5 3.7 2.8 15 295 8,8 240 5.5 3.6 2.8 16 300 8.6 240 5.0 3.3 2.0 17 250 8.9 240 3.0 2.8 18 250 9.2 2.4 2.8 19 260 S.O 1.6 3.0 2.8
■20 260 9.0 2.8 2.7 21 270 8.4 3.7 2.6 22 290 7.9 3.3 2.6 23 30 C 7.6 3.2 2.6
Time: 172.5°E. Sweep: 1.0 Me to 13.0 Me.
TnMe 2?
Peiping, China (39.9°N, 116.4°E) January 1940
Table ^2
Fukaura, Japan (40.6°N, 139.9°ii) January 1948
Time: 135.0°^. Sweep: 1.0 Me to 17.0 Me, manual operation.
Table fil
Lane how, China (36.1°N, 103.8°B) January 1948
Time: 120.0°E. Sweep: 2.3 Me to 14.0 Me in 15 minutes, manual operation
Time: 105.0°E. Sweep: 2.4 Me to 16.0 Me in 15 minutes, manual opera;:
16 Table 25 Table 26
. o Cnungking, China (29.4 I. 106 H°E) January 1948 Huancayo, Peru (12.0°5, 75.3°2) January 1948
Time h'F2 f°F2 h'Fl f°Fl h'E f°E fEs F2-i\n000 Time h'F2 f°F2 h'Fl f°Fl JL1.?—, f°E rs» F2-;.:3Poo
00 320 5.2 2.5 00 305 8.4 (2.7) 01 300 5.0 2.6 01 280 7.8 2.8 02 290 4.6 2.6 02 265 7.4 3.0 03 305 4.0 2.6 03 245 6.9 3.1 04 330 3.5 2.6 04 230 6.5 3.1 05 335 3.1 2.5 05 240 5.6 2.8 3.2 06 320 3.2 2.6 2.5 06 270 7.7 2.0 2.9 3.0
-07 295 6.7 3.3 2.7 07 250 10.3 2.5 4.8 2 9 oa 280 10.8 280 155 2.8 4.2 2.8 08 230 11.9 3.5 7.2 2.6 09 275 12.1 260 130 3.1 4.4 2.9 09 230 12.7 220 5.5 3.8 9.9 2.4 10 290 12.2 260 4.7 2.8 10 280 12.2 220 5.4 4.0 10.0 2.2 11 300 13.5 260 120 3.4 5.0 2.7 11 280 10.9 210 5.4 10.0 2.2 12 305 13.7 250 120 3.6 4.5 2.6 12 280 1U.6 210 5.5 10.0 2.1 13 320 14.2 260 130 3.5 4.2 2.6 13 280 11.2 210 5.4 10.0 2.1 14 30 G 14.4 270 130 3.4 4.4 2.6 14 290 10.8 210 5.4 4.0 5.8 2.1 15 290 15.2 245 120 3.2 4.5 2.7 15 230 11.3 215 5.4 3.8 9.8 2.2 16 260 15.2 no 2.9 3.6 (2.7) 16 225 11.6 3.5 9.6 2.2 17 240 14.0 130 2.5 3.6 2.8 17 260 11.8 2.9 5.5 2.2 18 240 10.9 3.6 2.7 18 290 11.9 2.0 2.5 2.2 19 260 10.6 3.0 2.7 19 340 (10.2) (2.2) 20 260 9.4 2.8 20 420 9.7 2.0 21 250 8.4 2.8 21 430 9.0 2.0 22 260 5.4 2.6 22 400 (9.1) (2.3) 23 325 4.8 2.5 23 340 (8.5) (2.5)
lime: 105.0°E. Time: 75.0°W.
Sweep; 1.7 Me to 20.0 Me in 15 minutes , manual operation. Sweop: 16.0 Me to 0.5 Me in 15 minutes 9 automatic operation.
Table 27 Table of
Fiji Is. (18.0°S 178.2°£) January 1948 Townsville, Australia (19.4°ii, 146.5°S) Januury 1948
Time h'F2 f°F2 h'Fl f°Fl h'E r°E fEs F2-inOOO Time h'F2 f°F2 h'Fl f°Fl h'E f°E fEs F2-M3000
00 300 10.6 3.8 00 268 9.5 3.3 2.8
01 290 10.2 3.5 01 250 9.3 2.0 (2.9)
02 305 9.8 2.9 02 240 9.0 3.0 2.0
03 290 9.7 3.3 03 250 8.4 2.9 2.8
04 280 9.6 2.8 04 260 8.0 2.8 2.8
05 250 9.1 2.7 05 260 7.4 2.7 2.7
06 250 9.3 100 (1.8) 3.3 06 250 7.3 1.8 3.0 2.8
07 235 9.2 105 2.6 4.6 07 240 7.5 240 2.8 3.4 2.9
08 255 9.4 220 105 3.3 6.0 08 300 8.5 220 5.1 3.4 4.0 3.0
09 310 10.2 230 6.3 100 3.7 5.7 09 310 9.5 210 5.7 3.8 4.2 2.9
10 335 11.0 220 6.0 108 4.0 5.6 10 350 10.2 200 6.0 4.0 5.7 2.7
11 370 11.6 220 6.2 105 4.1 5.4 11 360 11.4 200 6.2 100 4.0 5.3 2.6
12 400 12.7 230 6.2 no 4.2 5.3 12 350 12.0 200 6.0 4.1 5.6 2.7
13 380 D 230 6.2 no 4.2 5.3 13 350 12.0 200 6.0 100 4.2 5.0 2.6
14 360 D 210 6.0 no 4.1 5.6 14 345 12.4 200 6.0 100 ^4.0 5.5 2.7
15 360 D 230 6.2 no 3.9 5.6 15 332 12.0 205 5.8 loo 3.9 4.8 2.8
16 345 13.2 230 5.9 108 3.5 5.4 16 328 11.5 220 5.7 100 3.6 3:8 2.7
17 330 11.6 100 3.0 5.4 17 300 10.3 225 100 3.2 3.2 2.7
18 (260) 10.8 100 2.2 5.3 18 250 9.5 2.5 3.6 2.7
19 280 10.5 4.1 19 270 9.5 3.4 2.6
20 340 10.6 4.6 20 300 9.5 3.0 2.6
21 330 10.8 3.1 21 305 9.8 2.9 2.6
22 310 11.2 3.4 22 300 10.0 2.8 (2.6)
23 305 10.8 3.3 23 280 10.0 2.8 2.8
Time: 180.0°2. Time: 150.0°E
Sweep Upper limit, 13 .0 Me. Sweep : 1.0 tic to 13.0 Me in 1 minute 55 seconds.
■Table 29
|£arotonga I. (21 ,3°S. 159.8CK) January I a 43 0'o&rra, «.uetralia [ 35 - 1r>°£i <7 ar.uar;/ 1948
h*F2 f°F2 h'Fl f°Fl h’S f°E rss P2-j;:ooo Tine h*F2 f°F2 h * FI f°Fl h'E f or? fEs F2 -M3000
00 11.2 00 290 8.0 4,0 2.7
01 01 - 260 7.7 3.6 2.7
02 260 7.3 3.4 2.6
03 9.2 03 270 6.8 3.2 2.6
04 04 260 6.0 3.0 2.6
05 278 6.0 1C5 1.6 3.0 2.7
06 9.7 06 250 6.4 110 2.5 3.2 2.8
07 10.1 07 230 6.9 240 4.6 ICO 3.1 3.8 2,8
08 10.4 08 .330 7,2 210 5.0 100 3.5 2.8
09 io.a 09 360 7.6 210 5.4 100 3.6 5.0 2.7
10 11.6 10 390 8.0 200 5.6 ICO 3.9 6.0 2.7
11 12.3 u 365 8.2 200 5.9 100 4.0 5.9 2.6
12 13.5 12 360 8.5 200 5.7 100 4.0 5.4 2.6
13 14.1 13 390 8.8 200 6.0 100 4.0 4.3 2.6
14 14.3 14 265 8.9 200 5.7 10 3,9 2.7
15 13.8 15 360 9.5 200 5.5 100 3.8 2.7
'16 13.7 16 340 8.5 200 5.4 100 3.5 2.7
17 12.5 j.7 225 8.4 210 4.S 100 3.2 2.8
18 12.2 18 240 8.5 100 2.8 3.3 2.8
19 11.4 19 250 8.0 105 1.8 3.4 2.8
20 11.0 20 250 9.2 3.5 2.7
21 11.3 21 290 8.8 ■3.6 2.6
22 11.6 22 3-00 8.3 3.8 2.6
23 11.3 23 290 e.i 3.5 2.7
Time: 157.5°*. Ti 5B6 150.0°S
Sweep: 2.0 Me to 16.0 Me, manual operation. Sweep! 1.0 Me to 15.0 Mo in 1 minute 5o seconds.
Hobar , Tasmania (42.8°
Tabic 31
3. 147.4°S) January 1948 Christchurch,
Table 32
Sew Zealand (‘s3.5°S, 172.7°2) January 1948
Time h'F2 f°F2 h'Fl f°Fl . h'E f°E fEs F2-M3000 Time h'F2 f°F2 h'Fl f°Fl h'E fO£ fEo F2- r.noob ♦
00 290 6.7 3.0 2.6 OC 300 7.6 3.1 2.5 01 26G 6.2 2.5 2.5 01 300 6.9 3.1 2.5 02 265 5.8 1.8 2.5 02 300 6.5 2.8 2.5 03 260 5.5 2.6 2.5 03 290 6.3 3.3 2.5 04 235 6.0 2.7 2.6 04 290 5.0 7.8 2.6 05 275 5.0 2.1 2.8 os 280 5.7 1.6 3.5 2.7 06 250 5.5 238 100 2.5 2.7 2.8 06 265 6.4 250 4.1 2.5 3.3 2.8 07 340 6.1 250 4.6 100 3.0 3.2 2.8 07 300 7.1 250 4.9 3.0 A 4 2.8 03 395 6.6 232 4.9 100 3.4 3.7 2.7 08 330 7.4 245 5.1 3.4 4. 7 2.7 09 410 6.3 210 5.2 100 3.5 4.8 2.7 09 355 7.8 240 5.5 3.6 5.3 2.7 10 408 7.0 210 5.4 100 3.8 5.0 2.7 10 360 8.2 230 5.5 3.8 5.4 2.7 u 440 7.0 240 5.5 6.6 2.6 n 380 6.3 240 5.6 3.8 5.5 2.7 12 445 7.0 208 5.6 100 3.8 4.4 2.5 12 410 8.0 230 5.8 3.9 5.5 2.6 13 405 7.4 21C 5.5 4.2 2.7 13 410 3.2 230 5.3 3.8 5.0 2.7 14 425 7.5 225 5.5 100 3.8 4.0 2.6 14 400 8.2 230 5.7 *3.8 2.6 15 400 7.5 205 5.5 100 3.7 3.7 2.6 15 400 0.2 240 5.8 3.? 2.6 16 330 7.5 215 5.4 100 3.5 3.5 2.7 16 365 8.2 240 5.5 3.5 4.3 2.6 17 350 7.5 236 5.0 100 3.3 3.6 2.8 17 345 8.1 240 5.0 3.2 2.6 18 320 7.4 250 4.5 100 2.8 3.4 2.8 18 275 8.3 250 4.2 2.7 3.8 2,7 19 265 •7.5 no 2.3 3.3 2.8 19 280 3.2 2.0 3.5 2,7 20 290 7.6 3.5 2.7 20 290 8.4 1.2 3.1 2.6 21 220 7.5 4.0 2.6 21 290 8.5 3.2 2.5 22 290 7.5 4.0 2.6 22 300 8.2 3.# 2.5 23 290 7.0 3.3 2.6 23 300 8.0 3.6 2 K
Time: 150.0°E. Time: 172.5°E.
Sweep: 1.0 Me to 13.0 Me in 1 minute 55 seconds. Sweep: 1.0 Me to 13.0 Me.
18 Table 33' Table 31
Slouch, England (51.5°N, 0.6°W) December 1947
Time: Local. Sweep: 0.5 Me to 14.0 Me in 6 minutes; 14.0 Me to 25.0 Me,
manual operation. •Average values except for f°F2 and f£s, which are median values. #Less than 3 observations.
Peiping, China (39.9°H, 116.4°E) December 1947 !
i
Time h'F2 f°F2 h'Fl f°Fl h'E f°E fEs F2-M3000
00 3.9
01 3.6
02 3.8
03 3.7
04 3.8
05 3.8
06 4.5
07 5.4
08 9.8 09 11.2 10 (11.8) 11 12.4
12 12.4
13 12.0 14 12.0 15 (12.2) 16 11.6 17 10.3 18 (9.2)
19 8.8 20 7.4
21 (6.0) 22 5.6
23 4.4
Time: 120.0°E. Sweep: 1.7 Me to 20.0 Me in 15 minutes, manual operation.
Table 35 Table 36
L an chow, China (36.1°N, 103.8°E) December 1947 Hanking, China (32.1°H, 119.0°E) December 1947
Time: 105.0°E.
Sweep* 2.3 Me to 16.0 Me in 15 minutee, manual operation. Time: 120.0°E. Sweep: 1.7 Me to 15.0 Me in 20 minutes, manual operation.
Chungking, China (29.4° N, 106.8°2) December 1947 Slough, England (S1.5°il 0.6°tf) November 1947
Time h'F2 f°F2 h'Fl f°Fl h'3 f°E fEs F2 -M3000 h'F2 f°F2 h'Fl f°Fl h'E f°E fEs F2- M3 000
00 320 5.0 2.4 00 317 4.5 1.0 2.4
01 330 4.7 2.5 01 318 4.4 02 320 4.4 . 2.5 02 315 4.2 2.4
03 340 3.6 2.5 03 300 4.0 04 325 3.6 2.7 04 280 3.8 2.6
05 330 3.2 2.5 05 265 3.6 3.0 2.6
06 340 3.4 2.5 06 271 3.4 2.7 2.5
07 305 7.6 2.8 2.7 07 247 5.5 139 1.6 3.3 08 290 12.0 280 130 2.8 4.0 2.7 08 227 9.2 120 2.1 3.3 3.0 09 280 (14.0) 270 120 3.] 4.1 2.8 09 226 12.2 117 2.6 3.3 10 300 14.5 260 ,135 3.4 4.6 2.7 10 226 13.6 220 5.0# 111 2.9 2.9 11 300 14.0 260 5.8 130 3.6 4.5 2.6 11 227 14.3 112 3.0 12 205 14.3 270 6.8 130 3.7 4.2 2.6 12 231 14.1 255 5.6# 110 3.1 2.8 13 320 14,5 260 6.2 120 3.6 4.4 2.6 13 229 13.9 112 3.0 14 320 14.7 260 5.7 130 3.4 4.0 2.6 14 235 13.8 112 2.7 2.8 15 320 15.4 280 120 3.2 4.2 2.7 15 231 13.3 118 2.3 3.3 16 290 15.0 280 130 2.7 3.7 2.7 16 223 12.3 135 1.8# 3.3 2.8 17 270 14.8 250 120 2.2 3.5 2.8 17 222 10.9 3.3 13 250 12.5 3.0 2.7 18 224 8.6 3.2 2.8 19 260 9.6 2.8 2.8 19 228 6.9 3.2 20 260 9.4 2.4 2.8 20 251 5.5 3.2 2.6 21 260 8.4 2.7 21 285 5.0 3.2 22 280 6.5 2.6 22 309 4.7 2.5 2.4 23 290 5.6 2.4 23 317 4.6
Time 105.0°E. Time. Local. Sweep! 1.7 Me to 20.0 Me in 15 minutes , manual operation. Sweep! 0.5 Me to 14.0 Me in 6 minutes; 14.0 Me to 25 .0 Me,
manual operation. •Average valuer except for f F2 and fEs which are median values. #Less than three observations.
Lanchow, China 103.8°E)
Table J2
November 1947 Delhi India (38
Table A0
o o .6 N, 77.1 E) November 1947
* 9
Time h'F2 f°F2 h'Fl f°Fl h' E f°E fEs F2-M3000 Tine * f°F2 h'Fl f°Fl h'E f°E fEs F2-M3000
bo 360 5.0 2.4 00 390 6.7 2.6
01 355 4.7 2.4 01 360 6.8
02 360 4.6 2.5 02 360 5.8
03 360 4.8 2.4 03 (360) (6.3)
04 340 4.7 2.5 04 330 4.7 2.7
05 360 4.3 2.5 05 360 5.0 06 340 4.3 2,5 06 360 6.0
07 300 8.8 2.6 07 360 10.5
08 280 13.5 280 155 2.7 2.6 08 360 13.0 2.9
09 280 14.5 270 150 3.1 3.5 2.6 09 360 14.0
10 300 14.5 280 160 3.5 3.8 2.6 10 390 (14.2)
11 300 14.5 270 150' 3.7 3.6 2.6 11 420 (14.5)
12 320 14.6 270 150 3.8 2.5 12 420 (14.6)
13 320 15.0 280 150 3.8 3.6 2.5 13 405 (14.7)
14 305 15.0 280 150 3.5 3.4 2.5 14 405 (14.5)
15 3C0 14.5 270 150 3.4 3.7 2.5 15 (420) (14.5)
16 300 14.0 280 150 2.8 2.5 16 (405) (14.5) 17 280 13.5 280 140 2.5 17 390 (14.4)
18 18
IS 19
20 20 360 12.0 3.0 21 300 6.7 2.6 21 360 10.2
22 320 5.8 2.5 22 360 8.1
23 340 5.2 2.5 23 39.0 7.3
Time 105.0°E Time Local. Sweep: 2.4 Me
o
sO
o
-p Me, manual operation. Sweep: 1.8 Me to 16.0 Me in 5 minutes, manual operation. •height at 0.63 f°F2.
••MoOOO, average values; other columns, median values„
Bombay, India (19.0°N, ?3.0°E) November 194? November 1947
• •
Tine : ?^2 wi F¥i 572 r°B rS* P2-M3000
00 (14.6) 2.8 Cl (39C) (12.9) 02 (360) (10.1) 03 (330) (8.9) C4 (300) (7.2) 3.2 05 (330) (5.5) 06 (360) (6.2) 07 (330) 11.0 08 345 14.0 2.9
09 360 15.1 10 (405) (15.2) 11 15.3 12 (15.3) 13 (15.5) 14 (15.5) 16 (15.7)
16 (15.7)
17 (15.7)
18 (15.6) 19 (15.6) 20 21 (15.2) 22 (15.2) 23 (15.5)
Time: Local. Sweep: 1.3 Me to 1G.0 Me in 5 mir.utec, manual 'peratirn. •Height at. 0.83 f°F2.
••M30GQ, average values; other columns, median values.
Madras, India (13.0°N, 80.2°£)
Tine * f°F2
CO 01 02 03 04 05 06 07 420 1) .0
08 480 12.9 09 540 14.0 10 600 (14.0) 11 600 (14.0) 12 600 13.9 13 600 13.8 14 600 13.9 15 660 13.8 lb oUO 13.7 17 600 13.2 18 600 13.0 19 600 (12.4) 20 (12.2) 21 (12.3) 22 (13.0) 23
Time! Local.
2.4
2.1
2.1
2.1
Sweep; 1.8 Me to 16.0 Me in 5 minutes •Height at 0.83 f°F£.
••M3000, average values
manual operation,
otner columns, median values.
v,bU,42»
Falkland Is. (51.7°s, 57.ft0'*) November 1947
Time: iioc.,.1. Sweep: 2.2 Me to 16.0 Me in 1 minue. * average values except f F? and fLe, which are median values. fOne or two values only.
Delni, India (28.6°N, 77.1°S) October 1947
Time: Local. Sweep! 1.8 Me to 16.0 Me in 5 minutes, manual operation. •Height at 0.83 f°?2.
••M30Q0, average values; other columns, median values.
Table It 21
Table L5
Jombay, India (19.0°K, 73.0°Ji) October 1947
Cime * f°F2
00 (14.5)
01 (360) (14.3) 02 (330) (14.6) 03 (360) (9.5) 04 (7.9) 05 (360) (6.6) 06 (360) (7.8) 07 330 12.0
08 360 14.2 09 420 15.1 10 (465) (15.2)
11 (15.3)
12 (15.3) 13 (15.3) 14 (15.4) 15 (15.3)
16 (15.3) 17 (15.5) 18 (15.4) 19 (495) (15.4)
20 (15.3) 21 525 15.1 22 540 14.9 23 (16.1)
Time Local.
f°Fl h'E f°E fEs F2-M3000
2.7
Sweep: 1.8 Me to 16.0 Me in 5 minutes, manual operation. •Height at 0.83 f°F2.
••M3000, average values; other columns, median values.
Madras, India (13.0°N, 80.2°*;) October 1947
Time * f°F2 h'Fl f°Fl h'E f°E fEs F2-M3000
00 01 02 03 04 05 06 07 300 11.5 08 480 (14.0) 09 (14.0) 10 (540) (14.0) 11 600 (14.0) , 12 600 (14.0) 13 630 13.8 14 600 (14.0) 15 (600) (14.0) 16 (630) (14.0) 17 630 (14.0) 16 600 13.6 19 (660) (13.0) 20 (12.8) 21 (13.0) 22 (13.0) 23
Time Local.
Sweep: 1.8 Me to 16.0 Me in 5 minutes, manual operation. •Height at 0.83 f°F3.
Table LI*
Tromso, Norway
Hourl\ Monthly Averan ->s of f°F2 Observations
(69.7°H, 18.9°E) 1945
Time Jan. Feb. Mar. Apr. h'E f°E fEs F2MM000
00 3.2 3.1 3.5 3.7 01 2.9 2.7 3.2 3.6 02 3.5 3.0 2.2 3.5 03 2.8 2.7 2.5 3.2 04 2.9 3.0 2.5 3.5 05 2.2 2.8 2.7 3.8 06 2.1 2.3 3.2 4.1 07 1.7 2.9 3.7 • 4.4 08 1.7 3.5 4.0 4.6 09 2.9 4.0 4.4 4.8 10 3.8 4.6 4.5 5.2 11 4.5 4.9 4.7 5.0 12 4.7 5.2 4.8 5.1 13 4.6 5.2 5.0 5.0 14 4.2 4.9 4.8 5.1 15 3.8 4.7 4.8 4.9 36 3.2 4.2 4.4 4.9 17 2.5 3.8 4.2 4.8 18 2.3 3.1 3.8 4.7 19 3.4 3.2 3.8 4.6 20 3.6 2.8 3.5 4.3 21 3.6 3.0 3.0 4.2 22 3.0 3.4 3.4 4.1 23 3.7 3.8 3.4 3.8
Time 15.0°E •These data were obtained through the courtesy of Dr. W. R, Piggott, National Physical Laboratory, England, and Dr. 0. Burkard, University of Graz, Austria.
Table A&*
Tromso, Norway
Hourly iionthlv Average s of f°F2 Observations
(69.7°M. 18.9°E) 1944
Time June July AUg. Sept. Oct. Nov. Dec. F2-M8000
00 4.0 3.9 3.4 3.0 2.8 2.6 2.8 01 4.0 3.8 3.4 3.2 2.8 2.7 3.2 02 3.9 4.0 3.3 3.1 3.1 3.1 3.3 03 3.9 3.9 3.3 2. 7 3.1 2.9 2.8 04 3.9 3.9 3.2 2.8 2.7 3.0 2.6 05 3.9 3.9 3.5 3.1 2.4 2.5 2.2 06 4.0 4.0 3.8 3.6 2.5 0.6 2.1 07 4.1 4.1 4.1 3.9 3.3 2.6 1.6. 08 4.2 4.3 4.2 4.1 4.1 2.7 2.2 09 4.2 4.3 4.3 4.3 4.6 3.6 2.4 10 4.4 4.3 4.4 4.4 4.7 4.0 3.4 11 4.2 4.3 4.4 4.5 4.6 4.3 3.8 12 4.2 4.2 4.4 4.5 4.8 4.3 4.1 13 4.2 4.2 4.3 4.5 4.8 4.1 3.7 14 4.2 4.2 4.3 4.4 4.5 *4.0 3.1 15 4.2 4.2 4.3 4.4 4.5 3.5 3.0 16 4.1 4.2 4.3 4.3 4.2 3.1 1.7 17 4.2 4.2 4.3 4.2 4.4 2.7 2.7 18 4.2 4.2 4.1 4.0 3.7 2.3 3.1 12 4.2 4.1 4.0 3.9 3.6 2.6 3.1 20 4.1 4.1 3.9 3. 7 3.6 2.3 4.2 21 4.0 4.0 3.7 3.5 3.8 2.6 3.2 22 3.9 4.0 3.7 3.5 3.5 2.6 3.3 ?3 3.9 3.9 3.5 3.2 3.0 2.5 3.2
Time: 15.0°E. *These data 7<ere obtained through the courtesy of Dr. 77. R. Figgott,
National Physical Laboratory, England, and Dr. 0. Burkard, University of Graz, Austria.
Tromso, Norway (69.7°N, 18.9°E) August 1943 Canberra, Australia (35.3°iS, 149.0°E) December 1937
Time: 15.0°S. ••These data are hourly monthly averages of f F2 observations, and were obtained through the courtesy of Dr. W. R. Pig^ott, National Physical Laboratory, England, and Dr. 0. Burkard, University of Craz, Austria.
••
Time h'F2 f°F2 h'Fl r°n . h'S r°E fE. F2-M3000
00 295 7.8 4.7
01 296 7.1 4.8
02 308 6.8 4.8
03 322 6.2 4.4
04 330 5.9 4.4
05 296 6.0 no 2.5# 3.6
06 269 6.8 290# 4.3 127 2.6 3.9
07 280 7.6 255# 4.4 120 3.1 5.3
08 291 8.4 233 4.9 117 3.4 6.1
09 331 8.9 235 5.3 115 3.6 6.6
10 331 9.4 228 5.3 114 3.7 6.6
11 358 9.6 217 5.5 116 3.8 6.1
12 348 9.5 227 5.5 112 3.8 5.9
13 350 9.7 220 5.5 106 3.7 6.4
14 344 9.5 223 5.4 108 3.7 5.3
15 299 9.2 228 5.3 112 3.6 5.4
16 271 8.9 228 5.0 116 3.4 5.0
17 250 8.4 241 4.5 121 3.1 4.2
18 265 8.4 230 4.0# 122 2.5 4.0
19 269 8.1 140# 2.4# 3.8
20 303 7.6 4.4
21 331 8.5 5.0
22 343 8.5 4.0
23 325 7.9 4.8
Time: 150.0°E. Jweep: 2.2 Me to 13.0 Me in 2 minutes. •Average values.
••Reported as "Abnormal JC." #0ne or two values only.
Canbei ■ra, nuetralla (35.3°5, 149
Table
0°K)
51*
November 1937
• •
Canberra, Australia (35
Table 52*
3°S, 149.0°S) October 1937
•• Time h'F2 f°F2 h'Fl f°Fl h'2 f°E fEs F2-;.nooo Time h'F2 f°F2 h'Fl f°Fl h'E f°E fEa F2-:.nooo
00 309 8.2 3.6 00 300 7.4 3.0 01 308 7.6 3.9 01 300 7.0 3.0 02 315 7.1 3.7 02 307 6.5 3.0 03 315 6.7 3.5 03 312 6.2 3.3 04 318 6.4 3.4 04 311 6.3 3.0 05 302 6.5 (140)# 2.2# 3.1 05 294 6.3 3.1 06 267 7.0 221 3.9# 130 2.4 3.6 06 252 7.2 310# 2.4 3.3 07 291 7.7 232 4.6 122 3.0 4.5 07 246 8.2 230 4.2 2.9 3.9 08 320 8.4 235 5.0 116 3.3 4.6 08 269 8.9 222 4.7 3.3 4.0 09 343 8.9 230 5.2 114 3.5 5.0 09 290 9.4 218 4.9 3.5 4.5 10 340 9.1 219 5.2 106 3.6 5.5 10 280 9.7 214 5.0 3.7 4.3 11 328 9.3 212 5.2 108 3.7 5.3 11 274 10.0 210 4.9 3.7 4.3 12 330 9.2 218 5.2 106 3.7 5.4 12 261 10.1 308 4.8 3.7 4.3 13 342 9.2 216 5.4 106 3.6 5.1 13 272 10.2 217 4.9 3.8 4.5 14 334 9.2 222 5.2 104 3.6 5.3 14 253 10.0 217 4.8 3.7 4.5 15 332 8.9 231 5.1 110 3.5 5.0 15 263 9.8 228 4.6 3.5 4.5 16 293 8.7 233 4.9 112 3.3 5.0 16 ;j7o 9.7 230 4.4 3.2 3.9 17 260 8.6 246 4.5 118 2.9 4.4 17 26 7 9.7 243 4.0 2.7 3.3 18 294 8.6 240 4.2# 120 2.4 4.1 13 254 9.6 280,7 4.7# 2.4# 3.6 19 293 8.7 120# 2.3# 4.7 19 261 9.1 3.4 20 312 8.6 4.4 20 275 8.7 3.8 21 328 8.8 4.4 21 288 8.4 4.0 22 330 8.7 4.5 22 294 8.0 3.6 23 321 8.6 4.2 23 303 7.7 3.5
Time; 150.0°£. Time; 150.0°S iweep ; 2.2 Me to 13.0 Me in 2 minutes i>we«.'p: 2.2 Me to 13.0 Mo in 2 minutes.
••Reported as "abnormal E.rt #Qne or two values only.
•average values. ••Reported as "Abnormal 35.n
jpOne or two values only.
23 '•laCi? o-j*
Table 54*
1 larger rn* iiU.st raila (35 :<°i, re September 1937 ... -u< s t: alia ( o 3°i, l4r r °- • August 1937 '-u
r.)
r°F2 h * FI f°Fi h'E r°E fSs F2-:..'1000 •Tine h1F2 r°F2 h'Fl f°Fl h' f°E fEs F2-:,;7000
! -* 7.2 7.0
;:c - 2H? 5.6 3.6 - o 3.1 01 29..’ 5.5 3.5
2c 7 3 2 02 292 5.4 3.6
;0:< 256 6.0 3,4 03 463 5.3 3. 7
U 273 3.1 04 272 4.9 4.1
05 272 5.5 3.5 05 234 4.5 3.5
06 248 3.0 06 281 4.5 3.5
227 8.9 2.4 7.9 07 239 7.5 3.3
OH 10.4 222 4.1 2.S 4.0 08 225 9.6 230? 122 2.6 3.4
09 240 11.1 215 4.4 3.2 5.0 09 236 10.4 a5u 4.3 115 3.1 4.0
10 233 11.3 211 4.6 3.4 4.2 10 240 10.6 225 4.3 113 3.3 4.3
Jl 236 11.6 205 H. 6 3.5 4.4 11 236 io. a 220 4.4 112 3.4 4.0
3.2 238 n.e 201- 4.7 3.6 4.4 12 241 1U.9 217 4.5 113 3.5 4.0
13 241 11.3 203 4.7 3.5 4.8 13 239 10.5 217 4.4 114 3.5 4.6
14 233 11.1 202 4.5 3.5 4.5 14 241 10.4 216 4.2 113 3.4 3.9
15 236 10.7 207 4.3 3.4 4.1 15 240 10.0 219 4.0 114 3.2 3.8
16 234 10.4 215 3.9 2.9 3,6 16 242 9.8 230 4.0 119 2.8 3.8
17 229 10.2 3.0 f 2.4 3.7 17 237 9.6 2.2 3.4
1 16 224 9.8 3.0 18 236 8.9 3.7# 3.8
IS 231 9.0 2.9 19 246 8.1 3.4
20 246 8.7 3.3 20 251 7.5 3.0
21 250 8.3 3.6 21 262 6.6 3.8
22 254 r,o 3.9 zz 269 6.2 3.4
23 259 7.7 3.0 23 276 5.8 3.4
Tine: 150.0UE. Sweep: 2.2 I'c to 13.0 lie
*Average values. **Reported as "Abnormal K
if One cr two values only.
Time: 150.0 E. Sweep: 2.2 Me to 13.0 Me in 2 minutes. •Average values.
••Reported ae "Abnormal E. " # One or two values only.
Table
Canberra, Australia (35.3°S, 149.0°E)
55*
July 1937 Canberra, Australia (35.3°S, 1
Table
i9.0°E)
56*
June 1937
Time h'F2 f°F2 h'Fl f°Fl h'E f°E TEs F2-.M1000 Time h'F2 f°F2 h’Fl f°Fl h'E f°E fEs F2-M3Q00
00 XI 4.4 3.6 00 X2 4.2 3.C 01 312 4.5 4.4 01 313 4.2 3.1 02 X8 4.5 4.6 02 310 4.2 3.6 03 314 4.6 3.8 03 308 4.3 3.6 04 285 4.7 4.0 04 * 287 4.5 3.2 05 261 4.2 4.0 05 259 4.2 3.4 06 271 3.8 3.4 06 266 3.7 3.3 07 249 5.4 3.2 07 252 5.2 3.2 08 234 8.3 132# 2.4 3.8 08 227 8.3 123# 2.8 3.4 09 240 9.6 115 2.8 3.3 09 230 9.6 122 2.9 3.8 10 244 10.3 109 3.2 3.6 10 234 10.1 114 3.2 3.3 11 246 10.6 105 3.2 3.8 11 242 10.3 109 3.3 4.1 12 247 10.4 103 3.3 4.8 12 244 10.1 109 3.4 4.8 13 252 10.6 105 3.3 4.6 13 246 10.3 109 3.3 4.7 14 250 10.6 110 3.2 5.3 14 249 10.3 111 3.2 5.0 15 249 10.2 112 3.0 4.8 15 246 10.4 116 2.9 4.5 16 232 9.9 117 2.7 4.0 16 237 10.0 126 2.5 4.3 17 230 9.3 (130)# 2.3# 3.5 17 231 9.0 3.8 18 228 8.2 3.1 18 228 7.8 3.7 19 231 6.7 3.4 19 238 6.3 3.4 20 249 6.0 3.5 20 243 5.6 3.3 21 267 5.3 3.3 21 266 4.8 3.2 22 280 5.0 4.0 22 274 4.7 3.2 23 297 4.7 3.8 23 285 4.3 3.3
lime: 150.0°E. Sweep: 2.2 Me to 13.0 Me in 2 minutes •average values.
•*Reported as "Abnormal E." #0ne or two values only.
lime: 150.0°S. Sweep: 2.2 Me to 13.0 Me in 2 minutes •average values.
••Reported as "Abnormal E." #0ne or two values only.
24 Table 576
Table 58»
Canberra, Australia (35.3°S, 149.C°$) May 1937
Time h'F2 f®F3 h <n f°n h’8 f°8 ns* KJ-M3000
00 3U 4.4 4.1 01 316 4.4 3.5 03 318 4.4 3.6 03 318 4.4 3.5 04 299 4.4 3.4 05 380 3.9 3.8 06 288 3.6 3.4 07 259 5.8 130# 3,3# 3.3 08 249 8.3 135 2.6 3.9 09 249 9.5 122 3.0 3.6 10 256 10.2 118 3.2 3.7 11 258 10.4 119 3.5 4.8 13 258 10.5 120 3.5 4.8 13 366 10.6 120 3.5 4.6 14 260 10.6 118 3.3 4.4 15 255 10.6 122 3.6 5.1 16 247 10.2 128 2.6 3.5 17 236 9.5 3.7# 3.4 18 • 239 8.2 3.8 19 248 7.0 3.6 20 257 6.0 4.4 31 273 5.3 3.9 23 293 4.8 4.7 23 305 4.6 4.5
Time: 150.0°®. Sweep: 2.2 Me to 13.0 Me in 2 minutee. •Average values.
••Reported, ae "Abnormal E. N #0ne or two values only.
Canberra, Australia (35.3°3, 149.0PE) April 1937
Jt«L
h9F2 t°V2 h'n h'E f°E fB« F2-M3000
00 327 6.0 4.0 01 333 5.9 3.8
03 333 5.9 3.5 03 312 5.9 3.4 04 294 5.7 3.5 05 294 4.8 3.6 06 309 4.6 3.8 07 376 7.1 130# 2.2# 3.4 08 272 9.2 135 2.8 3.8 09 380 10.8 131 3.2 4.2 10 278 11.0 125 3.2 4.2 ii 287 11.2 128 3.5 4.9 12 290 11.4 124 3.5 5.7 13 392 11.5 122 3.5 5.1 14 289 11.4 129 3.5 4.2
• 15 292 11.4 132 3.2 4.5 16 282 11.2 133 2.9 4.0 17 269 10.6 134 2.5 3.7 18 262 9.7 3.8 19 270 8.5 3.5 20 282 7.8 3.7 21 284 7.2 4.6 22 292 6.7 4.2 23 308 6.2 4.7
Time 150.0°®. Sweep: 2.2 Me to 13.0 Me In 2 minutes. •Average values.
••Reported ae "Abnormal E.w #0ne or two values only.
Table 55*
Canberra, Australia (35.3°S, 149.0°®) March 30 to 31, 1937
Time h'?2 ei3 fcS£XL h'B f°8 fB* ®2~M3o5o
00 6.7 01 6.5 02 6.4 03 6.2 04 5.9 05 5.6 06 5.8 07 7.9 08 10.0 09 10.5 10 11.0 11 11.2 12 11.4 13 11.4 14 11.3 15 10.9 16 10.9 17 10.9 18 10.6 19 9.4 20 8.7 21 8.3 22 7.6 23 7.1
3.0 3.1 3.3 3.3 2.9 3.4 3.2#
2.4 3.2# 3.0 3.6# 3.3 3.7# 3.6 4.7 3.7 4.6 3.6 5.8 3.6 4.6# 3.4 3.9 3.4 3.9 3.1 4.1 2.7 3.6
3.6 3.0 3.0 2.6 2.8 4.2
Time: 160.0°$. Sweep: 2.2 Me to 13.0 Me in 2 minutes. •Average values.
••Reported, at? "Abnormal E. H #0ne or two values only.
25
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Table 72
Ionospheric Storniness at v'ashinrton. D. G.
April 194?
Day Ionsopheric 00-12 GOT
character* 12-24 GCT
Princinal storms Deginning End
GCT GCT
Geomagnetic 00-12 GCT
character** 12-24, GCT
1 1 0 4 o *■** 1 4 2 q 1 2 3 2
l 2 2 2 1 5 1 1 1 1 6 2 1 O
4 7 1 2 3 3 n L 1 2 1 i Q / 0 1 1 i
10 0 •1 1 2 11 2 ■3 2 1 12 2 1 2 2 13 2 2 3 2 14 1 5 1300 2000 3 2 15 3 1 2 O 4* 16 I 2 1 2 17 X 3 1 2 If 1 *** O 2 19 2 1 1 1 20 2 2 3 2 21 2 4 1300 —/ 4 2 22 £ 7 —/ -/ 5 3 23 4 4 —/ 2300 2 2 24 3 1 2 2 25 2 4 1300 -/ 3 2 26 2 1 —/ 0100 2 3 27 2 1 3 2 2? 2 3 3 2 29 3 1 3 3 30 2 2 3 2
■^Ionosphere character figure (I-figure) for ionospheric storniness < at Washington, D. C., during 12-hour period, on an arbitrary scale of 0 to 9, 9 representing the greatest disturbance.
**Avcrape for 12 hours of Cheltenham, Maryland, geomagnetic K-figures or an arbitrary scale of 0 to 9, 9 representing the greatest disturbance.
***Eo readable record. Refer to table 61 for detailed explanation. /Dashes indicate continuing storm.
;ndden Ionian},ere Dj sturUtnees- ■Observed at .ashtnpton. D. C.
Anril 1946
— GOT
...... ... Location of Relative Other
Day ! eminni n." bind transmitters intensity
at
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phenomena
I 1 O'" ) L_1 1400 Ohio, D.C.,
Lnrland
0.1
1 16/r 1700 Oliio, D.C.,
Lnpland
0.0
*5 lr53 2020 Ohio, D.C., 0.03
4 1722 1750 Ohio, D.C., 0.3
5 1351 14,10 Ohio, D.C., Lnrland
0.2
6 16 OS 1645 Ohio, D. C., Lnpland
0.2
10 1/37 1505 Ohio, D.C., Lnpland
0.02
10 1146' ln05 OhiOj^D.C., 0.03
12 1605 1625 Ohio, D. C., Lnpla nd
0.1
13 17/0 1750 Ohio, Lnpland 0.1
14 1629 1910 Ohio, D. C. , Lnpland
0.0
16 1259 1320 Lnrland 0.2
1? 2236 2255 Ohio, D.C. 0.1 Terr.map.nulse** 2230-2240
20 1223 1255 Ohio, D.C., England
0.0 Terr.nap.nulse** 1223-1235
20 1446 1515 Ohio, D.C., Lnrland
0.03
b2 1615 1635 Ohio, D.C., Lnrland
0.1 Terr.nap.pulse** 1616-1630
23 1606 1655 Ohio, D.C., Lnpland
0.05
23 1930 b025 Ohio, D.C., England, Hew Brunswick
0.05
26 1417 1430 Ohio, Enpland 0.1
27 1247 1305 Ohio, D.C., Lnpland
0.2
*Ratio of received field intensity during SID to averape field intensity
before and after, for station 7/6XAL, 6060 kilocycles, 600 kilometers distant,
for all SID except the following: Station GUI, 13515 kilocycles, received in hew York, 53/0 kilometers distant, was used for the SID on April 16.
**As observed on Cheltenham magnetopram of the United States Coast and
Geodetic Survey.
39
f3
Q) i—I &
CO
C 0)
TD 'O 3 cn
03 <D > CL'
aJ
p
•H o
-p £0
> -P t>» CO u
: o o ) *H -P ( r—I CO
’ ^
! gj ! *3 i O : Cm g ) o
CO -H I <1> P . o CO : g bo • CO CO
,Q P. > p O
• -P £ W
<D X rH • a a Q co o -p •» C G u"\ O (DCV
•H O c
G a; O a> x -p
X) -P bl XJ C 3 O -H co -p x
CO
X5 -P *• C -P (0 CD <D X)
XJ CO G CO X3 CO CO C
a? co to h -P g xs c/3
•H XJ G <J Cm
bo • 3 0 0 a) X > Q)
Table
76
(Conti
nued)
Mlj
,e &
(Conti
nued)
40
TJ CD C U O Q) 10 ,£
C. O CO +J O
> <D C T3 •H *C
£ CD CO Fh <3
£ 'g <D G > QJ £ <U 'TJ CO C
rQ CD
Addre
ss le
tters
to
the
Centr
al
Rad
io P
ropagati
on
Lab
ora
tory
, 1
Bu
reau
of
Sta
nd
ard
s,
Wash
ingto
n
<!5,
D.
C.
Table 77 41
Provisional .Radio Propagation Quality Figures
(Including Comparisons with CBPL Warnings and CBPL Probable Disturbed Period Forecasts) March 1948
North Atlantic North Pacific
Quality CBPL* CBPL Geo- Quality CBPL* CBPL Geo-
figure Warning Forecast of mag- figure Warning Forecast of mag-
probable netic probable netic
disturbed KCh disturbed *Ch Day periods periods
EH O cD
EH O CD
8 8 cD cD
EH O cD
EH O cD
8 cD
8 cD
Eh EH O O CD cD
EH O cD
EH O cD
cm 1—t
1 rH o
** CM
ti rH
CM ^ rH CM
J, <4 O rH
cm 1—1
rH o
CM
A rH
CM H
1 i—t O
CM
d rH
CM ^ rH CM
A A O <H
CM rH
1 rH o
CM 1
CO i—i
1 5 6 X 5 3 6 5 X 5 3 2 5 6 X X 4 4 4 6 X X 4 4 3 5 6 X X X 4 2 5 5 X X X 4 2 4 6 6 X X 2 1 6 6 X X 2 1 5 7 , 6 X 2 2 6 6 X 2 2 6 6 6 2 2 6 5 2 2 7 6 5 2 1 6 6 2 1 8 6 6 0 2 7 6 0 2 9 7 6 2 2 6 7 2 2
10 7 7 1 2 6 6 1 2 11 7 6 0 1 6 6 0 1 12 5 6 X 3 2 7 7 X 3 2 13 5 (4) X X X 4 4 5 (4) X X X 4 4 14 5 6 X X X 4 3 5 5 X X X 4 3 15 (3)(2) X X X 6 5 (4)(4) X X X 6 5 16 (4) 5 X X 2 1 5 5 X X 2 1 17 6 5 X 3 1 6 6 X 3 1 18 6 6 2 1 7 6 2 1 19 7 6 2 2 6 5 2 2 20 6 7 2 2 6 6 2 2 21 7 7 3 2 6 5 3 2 22 7 6 1 2 6 6 1 2 23 6 6 1 1 6 6 1 1 24 7 6 1 0 6 7 1 0 25 7 7 1 2 7 7 1 2 26 7 6 1 2 7 6 1 2 27 6 6 3 2 6 6 3 2 28 7 6 X 2 0 6 6 X 2 0 29 7 6 X 1 1 7 6 X 1 1 30 6 7 X 3 3 7 7 X 3 3 31 7 6 X 2 2 7 6 X 2 2
Score! H 3 3 3 3 M 0 0 0 0 G 23 17 23 17
(S) 4 5 3 4
s 1 6 2 7
duality Figure Scale!
1 - Useless
2 - Very poor
3 - Poor 4 - Poor to fair
5 - Fair
6 - Fair to good
7 - Good 8 - Very good 9 - Excellent s.
Symbolsi
X Warning given or probable disturbed
date
H Quality 4 or worse
on day or half day
of warning
M Quality 4 or worse
on day or half day of no warning
6 Quality 5 or better on day of no warn¬ ing
(S) Quality 5 on day
of warning
S Quality 6 or better
on day of warning
( ) Qual ity 4 or worse
(disturbed)
Geomagnetic K- on the
standard scale of 0 to
9, 9 representing the greatest disturbance.
•Broadcast on WWV, Washington, D, C. Times of Warnings recorded to nearest half day as broadcast
42 Table 78a
Coronal observations at Climax, Colorado (5303A), east limb
Date Degrees north of the solar equator 09 Degrees south of the solar equator
GCT 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
19**S Apr. 2.7 ______ 2 3 3 5 8 7 7 ’5 10 13 19 19 5 10 li i4 16 15 17 13 7 7 U U 3 2 3 3 3 3 3 -25
28.7 -------- 2 3 3 5 12 17 15 16 37 30 13 8 10 96333333 3 34 U- 3222 -25 29.8 __________ 2 3 5 12 18 20 34 32 9 8 9 '4 1 3 4 334-- - ______ -25 30.7 _________ 2 3 6 7 12 20 20 26 22 8 66348 10 7553211---22 -25
Table 79a
Coronal observations at Climax, Colorado (6374A), east limb
Date Degrees north of the 3olar equator 0° Degrees south of the solar equator GCT 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
19u8 \pr. 2.7 2 5 4 1 1 2 2 _____ - _ _ _ -25
28.7 9 11 3111------------ -25
29.8 ______11111 _ 5 5 10 14 14 1 - - 55lii___-____-_-
30,7 - _ 2 4 1 5 8 1 18 10 in 111-- __ -25
'fable 80a
Coronal observations at Climax, Colorado (6704A). east limb
Date GCT
Degrees north of the solar equator 0° Degrees south of the solar equator
P 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
19u8 Apr. 2.7
28.7 29.8 30.7
1 1
Table 784 43
Coronal observations at Climax, Colorado (5303A), west limb
Date GCT
19'ig
Apr. 2.7 23.7
29.8 30.7
Degrees south of the solar equator 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5
s 3 2 2 2 5 2 6 7 12 ll 12 13 lU 12 12 10 l'l IS IS 9 5 7 7 5
2 5 U 3 2 2 - - - 2 5 37 39 4o 31 23 12 10 13 IS 20 27 23 IS 10
3 7 20 30 30 19 11 10 10 11 l'+ 17 1? 17 15 10
2 2 2 2 2 2 - - 2 7 U U 3 10 19 IS l6 13 10 1'4 17 20 IS IS 19 IS 13 10
0° _Degrees north of the solar equator_ 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
25 (-25
25 (-25
Table 79b
Coronal observations at Climax, Colorado (6374A), west limb
Date GCT
Degrees south of the solar equator °1 Degrees north of the solar equator P 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
19'ig Apr. 2.7
28.7 29. S 30.7
_____________ i 3 3 1 2
________! l l i 2 4 7 lU 15 15
.- - 2 2 7 22 12
. 1 10 11 12
3 3
12 2
37 12 S 2- ----------- 1 1 5 12 17 31 10 5---------
10 9 3 13 15 15 6 5 3 2 l 2138 13 10 533 3 1- -- -- --
r 25 -25 -25 -25
Table gQb
Coronal observations at Climax, Colorado (6704A), west limb
Date Degrees south of the solar equator 0°
Degrees north of the solar equator p GCT 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
19’>8
Apr, 2.7 -25 28.7 1 1_________________ -25 29. S ______________qqil 1 28
30.7 1 111--------------- -25
Table PI
A' viTcmi ■ iT Inn eh ’ .r •• 'I iit-latj ve Ormnot n'nnbers
uV'-ri i in/.r
Date 11 , * ‘ V* %, * * Date ii. r
Ik. T Jr/ -A 76
'“uj
1 201 160 16 AC. 200 2 222 190 17 A ? 19 C ri 227 194 10 2?7 2.. 6 /
H 220 in 19 nnr) ’ 22?
227 170 20 215 206 l 199 152 21 209 179 H 205 161 > > 226 164 r f 1°Z 151 O 93 24? 212 n 211 .167 24 253 245
1C *^no 17? r.c- 244 215 ii ^ > 9} in 26 2.11 190 .12 261 lc0 OO / 204 m 1 T 26/ 219 20 170 166 1/ . .) 24? 2° 154 16? “j r J 1 ^ 21c ?0 H? m
lie an 2 22.5 1?9.5
> ’'liiation or 1.1 observers; :•= -e ''arc 9. r: •orvitri ons at 2’irieh Observatory and ttc- stclions
■ w .2 . re; a.
GRAPHS OF IONOSPHERIC DATA 45
——LIMITING FREQUENCY"3 Me
-LIMITING FREQUENCY" 5 Me
-LIMITING FREQUENCY = 7 Me
Fig.2. WASHINGTON, D. C. APRIL 1948
--LIMITING FREQUENCY = 3 Me
— — LIMITING FREQUENCY" 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 4. FAIRBANKS, ALASKA MARCH 1948
46
( I
47
--LIMITING FREQUENCY = 3 Me
-LIMITING FREQUENCY = 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 10. SAN FRANCISCO, CALIFORNIA MARCH 1948
48
00 02 04 06 08 10 12 14 16 18 20 22 00
5
2 400
f— X 300
\ —
\ FI
) <
100 u
> 0 too
LOCAL TIME
90
LlI O
P|70 jO
»-,T Ko
u-z: op 50
LiJ§ o —I <-' 40 H A
/■' / V
LULU 30 qj cr
/ \ (I / r
cl p ^ 20 \
J 10
'n- » V. V ri v
V / d h A £ 00 02 04 0G 08 10 12 14 1 6 1 8 20 22 00
LIMITING FREQUENCY 3 Me
LIMITING FREQUENCY 5 Me
- LIMITING FREQUENCY- 7 Me
Fig 16. MAUI, HAWAI MARCH 1948
49
00 02 04 06 08 10 12 14 16 18 20 22 00
5
z 400
1— x 300 O UJ F?
/
1 200
< ^ 100
> o
100
L V / v T LOCAL TIME
90
o \
\
UJ Q 00
JO 1
so J f
/ ! A-
U.Z Op 50 ( 1 j\
J 7
t; A 4U k 1 4.
"v \ /
J / /
UJ UJ V- / i 7
a. 30 ujQ: Lj J J v
' \ /
CL O ^ 20
V J. 7 r
\ L J
10 1' 4 \ \
—-
7 V. .
/ • ' 00 02 04 06 08 10 1 1 4 16 18 20 22 00
LIMITING FREQUENCY 3 Me
LIMITING FREQUENCY 5 Me
- LIMITING FREQUENCY 7 Me
Fig. 20. GUAM I MARCH 1948
50
00 02 04 06 08 10 12 14 16 18 20 22 00
2 *
VIR
TU
AL
HE
IGH
T
IN
—
N>
04
4 O
O
O
C D
O
O
O
C
(F2 *
S " !f 1
E
PE
RC
EN
TA
GE
OF
TO
TA
L
TIM
E
FO
R
fE«.>
LIM
ITIN
G
FR
EQ
UE
NC
Y
—
rocn
m
<j>
-j
co
ld
o
oo
o
o
o
oo
o
oo
c
LOCAL TIME
1 .
y / t i
j / T I
L / \ f
l /i
A / A .. /
/ l 7 f
V
/ ’ \
s 7 V N*
/ ' x
V w
/ L /
Z 00 02 04 06 08 10 12 14 16 18 20 22 0
-LIMITING FREQUENCY= 3 Me
-LIMITING FREQUENCY =5 Me
-LIMITING FREQUENCY = 7 Me
Fig.24. PALMYRA I. MARCH 1948 i
51
00 02 04 06 08 10 12 4 16 8 20 22 00
1-
o S H.
) < 2 'oo 1— o:
> 0
100 LOCAL TIME
90
Lul o
i|7o ip
Jr£ 60
U_2
i-A
UJUJ
CE 30 OLp
^ 20 r\
10 / J
/ J / ll V / 7* ^7
\ \ 00 02 04 06 08 10 12 14 16 18 20 22 00
--LIMITING FREQUENCY 3 Me
— LIMITING FREQUENCY 5 Me
— LIMITING FREQUENCY 7 Me
Fig. 26. CLYDE BAFFIN , I- FEBRUARY 1 948
52
——LIMITING FREQUENCY - 3 Me
-LIMITING FREQUENCY' 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 30. PRINCE RUPERT, CANADA FEBRUARY 1948
-LIMITING FREQUENCY'3 Me
--LIMITING FREQUENCY'5 Me
_ . — LIMITING FREQUENCY' 7 Me
Fig. 32.PORTAGE la PRAIRIE, CANADA FEBRUARY 1948
53
00 02 04 06 08 10 12 14 16 18 20 22 00
VIR
TU
AL
HE
IGH
T
IN
KM
—
ro
oi
a
O
o
O
o
5 0
0
0
0
|F2~
in E
PE
RC
EN
TA
GE
OF T
OT
AL T
IME
F
OR
fE,.
> L
IMIT
ING
FR
EQ
UE
NC
Y
—
rotn
-P
»u
i<
j>
-N
ia>
too
o
oo
o oooo
ooc
LOCAL TIME
/ \ / \ j s \ //
/ JL / \ - L
00 02 04 06 08 10 12 14 16 18 20 22 00
--LIMITING FREQUENCY = 3 Me
-LIMITING FREQUENCY- 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 34. ST JOHN'S, NEWFOUNDLAND FEBRUARY 1948
54
°E Lilg <3-,
LOCAL TIME 7\ i r: 7- 7"
V J z1 \ J
\
. \ j /
lf L
l r 1 1 i
1 A 1: ! 1
v / r \ i
if- \ r
\ 1 \ •
1 1
1 T I 1 \ j i 1 1 \, j r \
12 ii ; I] L 00 02 04 06 08
—-LIMITING FREQUENCY = 3 Me
--LIMITING FREQUENCY'5 Me.
-LIMITING FREQUENCY ' 7 Me
Fig. 38. HUANCAYO, PERU FEBRUARY 1948
00 02 04 06
<rUJ
5^
HA Z (/. L±J OJ
■
FI
m
LOCAL TIME
n / *>
/
□
/
1 /■ / x x /
L L L vL.
j Js
\ / r1
/ /"
/ \ / —
V. A Pa ' \ \ \ J X
A 00 02 04 06 10 12 14
-—LIMITING FREQUENCY = 3 Me
--LIMITING FREQUENCY'5 Me
-LIMITING FREQUENCY ' 7 Me
Fig.40.JOHANNESBURG, U.UFS. AFRICA
20 22 00
FEBRUARY 1948
55
00 02 04 06 08 10 12 14 16 18 2 0 22 0 0
VIR
TU
AL
HE
IGH
T
IN
KM
—
ro
oj
o
o
o
o
3 0
0
0
0
MINIM 1 A ISOLATE E-LAYER OBSERVATION
F? SEI F 2J
A A
CE
NT
AG
E
OF
TO
TA
L T
IME
f E
,_> L
IMIT
ING
FR
EQ
UE
NC
Y
J -f*
Ol
0>
0D
l£>
O
>00000
ooc
LOCAL TIME
\
QL ^ UJ 01 CL O
^ 20
10
/
7
V / '
\ i /
00 02 04 06 08 10 12 14 16 18 20 22 00
—-LIMITING FREQUENCY = 3 Me
--LIMITING FREQUENCY" 5 Me
-LIMITING FREQUENCY" 7 Me
Fig. 44. FUKAURA, JAPAN JANUARY 1948
56
|
57
00 02 04 06 08 10 12 14 16 18 20 22 00
VIR
TU
AL
HE
IGH
T
IN
KM
—
ro
t>4
^
O
O
O
O
2_O
_
<2
0
0 -N
/ \
FJ? / 4 / N,
> If i
PE
RC
EN
TA
GE
OF T
OT
AL
TIM
E
FO
R
fE<
.> L
IMIT
ING
FR
EQ
UE
NC
Y
—
ro
-p»oi<
j)-jcd
ld
< ooo o
oo
oo
o<
4 l z' \\ LOCAL TIME
’ \ / A
j \ i
-4- / \ 1
1 / A 1 L u \
1
! t v
1 i \
j
/ i
L , '
1 i\
JL 1 1 i
1 4
\j JL 1 1
V i / 4
00 02 04 06 08 10 12 14 16 18 20 22 00
---LIMITING FREQUENCY = 3 Me
--LIMITING FREQUENCY = 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 51. HUANCAYO, PERU JANUARY 1948
58
-—“LIMITING FREQUENCY = 3 Me
-LIMITING FREQUENCY - 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 53. FIJI IS. JANUARY 1948
——LIMITING FREQUENCY = 3 Me
— — LIMITING FREQUENCY- 5 Me
-LIMITING FREQUENCY-7 Me
Fig. 5 5. TOWNSVILLE, AUSTRALIA JANUARY 1948
59
-LIMITING FREQUENCY = 3 Me
-LIMITING FREQUENCY =5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 58. CANBERRA, AUSTRALIA JANUARY 1948
60
-LIMITING FREQUENCY= 3 Me
-LIMITING FREQUENCY =5 Me
-LIMITING FREQUENCV = 7 Me
Fig. 60. HOBART, TASMANIA JANUARY 194 8
61
62
63
-LIMITING FREQUENCY - 3 Me
-LIMITING FREQUENCY = 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 71. CHUNGKING, CHINA DECEMBER 1947
64
-LIMITING FREQUENCY - 3 Me
-LIMITING FREQUENCY3 5 Me
-LIMITING FREQUENCY - 7 Me
Fig. 75. LANCHOW, CHINA NOVEMBER 1947
65
00 02 04 06 08
2 600
CM
£ 500'
ro CD O 400
y<
X 300
200
jO <t LlI
o11-
Li_ Z
°E UJ5 o-
■ I-A 2 n. LlI UJ
14 16 18 20 22 00
LOCAL TIME
INO DAT/ >1
00 02 04 06 08
——LIMITING FREQUENCY = 3 Me
— —LIMITING FREQUENCY= 5 Me
-LIMITING FREQUENCY * 7 Me
Fig. 31. MADRAS, INDIA NOVEMBER 1947
00 02 04 06 08 10 12 16 18 20 22 00
F2 s\
_
LOCAL TIME
i
INO D ATAl
- -
—— LIMITING FREQUENCY ■ 3 Me
— — LIMITING FREQUENCY = 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 85. DELHI, INDIA OCTOBER 1947
67
00 02 04 06 08 10 12 14 16 18 20 22 00
2 500
0J Ll_ 2- 400 rO CO
d 300
X 200 CD
100
100
Wi
F2
V >
!-INTERPOLATED F2 -LAYER VALUE
7 1 1 1 1 1 1 II 1 1 1 1 1
00 02 04 06 08 10
LOCAL TIME
In 0 AT a|
——LIMITING FREQUENCY=3 Me
-LIMITING FREQUENCY = 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 87. BOMBAY, INDIA OCTOBER 1947
68
00 02 04 06 08 10 12 14 16 18 20 22 00
Fig. 90. TR0MS0, NORWAY
69. 7°N, 18 9°E_APRIL 1945
69
70
71
00 02 04 06 08 10 12 14 16 (8 20 22 00
2
2 400
V?
x 3od o
UJ A
[FT 1 200
J < LeJ
> o L
100 LOCAL TIME
90 L L J.
UJ o 1 llro jO
r A
•rf .«o ■ e V AS
U.Z i \ r \ i 1 \ \ A | ,
o-, \ t \
HA 40 N , / ■- v T
UJLJ 30
ujQ:
\ / A
\ J a.p
^ 20 1 A 1 \ ~r^ l / 1 s . y~
10 r\ \ 1 f. \ \ A 1 i ^ , .'A s * -
l lx / < ! /
i /A
A
00 02 04 06 08 10 12 14 16 18 20 22 00
LIMITING FREQUENCY 3 Me
LIMITING FREQUENCY 5 Me
- LIMITING FREQUENCY 7 Me
Fig. I
id o CANBERRA, AUSTRALIA NOVEMBER 1937
72
— LIMITING FREQUENCY = 3 Me
— —LIMITING FREQUENCY=5 Me
-LIMITING FREQUENCY= 7 Me
Fig 109 CANBERRA , AUSTRALIA SEPTEMBER 1937
73
-—LIMITING FREQUENCY=3 Me
-LIMITING FREQUENCY = 5 Me
—— LIMIT ING FREQUENCY =7 Me
Fig. Ill, CANBERRA, AUSTRALIA AUGUST 1937
--LIMITING FREQUENCY - 3 Me
-LIMITING FREQUENCY - 5 Me
-LIMITING FREQUENCY - 7 Me
Fig.113. CANBERRA, AUSTRALIA JULY 19 37
74
-LIMITING FREQUENCY = 3 Me
-LIMITING FREQUENCY = 5 Me
-LIMITING FREQUENCY = 7 Me
Fig. 115. CANBERRA, AUSTRALIA JUNE 1937
---LIMITING FREQUENCY* 3 Me
-—LIMITING FREQUENCY* 5 Me
-LIMITING FREQUENCY = 7 Me
Fig.117. CANBERRA, AUSTRALIA MAY 1937
75
76
Index of Tables and Graphs of Ionospheric Data
in CRPL-F45
Adak, Alaska March 1948 .
Eaton’ Rouge, Louisiana March 1949 .
Bombay, India November 1947 . . . October 1947 . . .
Boston, Massachusetts March 1949 .
Canberra, Australia January 1949 . . . . December 1937 . . . November 1937 . . . October 1937 . . . September 1937 . . . August 1937. July 1937 . June 1937 . May 1937 . April 1937 . March 1937 .
Christchurch. New Zealand February 1949 . . . January 1949 . . .
Chungking, China January 1949 . . . December 1947 . . .
Churchill, Canada February 1949 . . .
Clyde, Baffin I, February 1948 . . .
Delhi, India November 1947 . . . October 1947 . . .
Fairbanks, Alaska March 1946 . . . .
Falkland Is. November 1947 . . .
Fiji Is. January 1948 . . .
Fukaura, Japan January 1948 . . .
Guam I. March 1948 . . . .
Table pare
10
11
20 21
10
17 22 22 22 23 2?
23 23 24 24 24
15 17
16 19
13
13
19 20
10
20
16
15
12
Figure page
46
48
65 67
46
59 71 71 72 72
73 73 74 74 75 75
55 60
57 63
51
51
64 66
45
66
58
55
49
Index (Continued)
Hobart, Tasmania January 1948 .; .
Huancayo, Peru February 1948 January 1948 ... . .
Johannesburg, Union of S» Africa * J February 1948 .
Lanchow, China January 1948 ......... December 1947 ......... November 1947 , . . %
Madras, India November 1947 ......... October 1947 .
Maui, Hawaii . March 1948 «... .
Nanking, China December 1947 .........
Ottawa, Canada February 1948 .... .
Palmyra I. Mar ch X948 ...... ...
Peiping, China January 1948 ......... December 1947 .........
Portage la Prairie, Canada February 1948 .........
Prince Rupert, Canada February 1948 .........
Rarotonga I. January 194? .........
St. John’s, Newfoundland February 1Q48 .........
San Francisco, California March 1^48 ..........
San Juan, Puerto Rico March 1948 .. . . . .
Slough, England December 1947 ......... November 1947 .........
Townsville, Australia January 1948 .. . . .
Trinidad, Brit. 7/est Indies March 1948 ..........
* © • * •
* © * •
® ® «s © e
Table page Figure page
17 .... 60
.14 ’ * 54 . 16 . , . 57
- 14 54
15 . 56 18 . 62
19 *. 64
20 65 21 , 67
11 48
18 62
14 53
12 50
15 56 IB • 61
13 52
13 52
17 59
14 53
11 47
12 49
18 61 19 63
16 58
12 50
78
Index (Continued)
Table na
Tromso, Norway April 1945. 21 March 1945 .. 21 February 1945. 21 January 1945....... 21 December 1944 .* 21 November 1944 . 21 October 1^44. September 1944.. 21 August 1944. 21 July 1944 21 June 1944 21 Aupust 1944 . 22
'Tashinpton, D.C. April 1Q4S. 10
-Vhite Sands, New Mexico March 194?. 11
Firure pare
68 68 68 68 69 69 69 69 70 70 70 70
45
47
CRPL and IRPL Reports Daily:
Radio disturbance warnings, every half hour from broadcast station WWV of the National Bureau of Standards. Telephoned and telegraphed reports of ionospheric, solar, geomagnetic, and radio propagation data.
Weekly: CRPL-J. Radio Propagation Forecast (of days most likely to be disturbed during following month).
Semimonthly: CRPL-Ja. Semimonthly Frequency Revision Factors for CRPL Basic Radio Propagation Prediction Reports.
Monthly: C'RPL- D.
CRPL-F.
Quarterly: ♦IRPL-A. ♦IRPL-H.
Basic Radio Propagation Predictions—Three months in advance. (Dept, monthly supplements to TM 11-499; Dept, of the Navv, DNC-13-1 ( DNC-13-1.)
Ionospheric Data.
of the Army, TB 11-499-, ), monthly supplements to
Recommended Frequency Bands for Ships and Aircraft in the Atlantic and Pacific. Frequency Guide for Operating Personnel.
Nonscheduled reports: CRPL-1-1. Prediction of Annual Sunspot Numbers. CRPL-1-2, 3-1. High Frequency Radio Propagation Charts for Sunspot Minimum and Sunspot Maximum. CRPL-1-3. Some Methods for General Prediction of Sudden Ionospheric Disturbances. CRPL-1-4. Observations of the Solar Corona at Climax, 1944-46. CRPL-1-5. Comparison of Predictions of Radio Noise with Observed Noise Levels. CRPL-7-1. Preliminary Instructions for Obtaining and Reducing Manual Ionospheric Records. NBS Circular 465. Instructions for the Use of Basic Radio Propagation Predictions.
Reports issued in past: IRPL-C61. Report of the International Radio Propagation Conference, 17 April to 5 May 1944. IRPL-G1 through G12. Correlation of D. F. Errors With Ionospheric Conditions. IRPL-R. Nonscheduled reports:
R4. Methods Used by IRPL for the Prediction of Ionosphere Characteristics and Maximum Usable Frequencies. R5. Criteria for Ionospheric Storminess. R6. Experimental Studies of Ionospheric Propagation as Applied to the Loran System. R7. Second Report on Experimental Studies of Ionospheric Propagation as Applied to the Loran System. R9. An Automatic Instantaneous Indicator of Skip Distance and MUF. RIO. A Proposal for the Use of Rockets for the Study of the Ionosphere. Rll. A Nomographic Method for Both Prediction and Observation Correlation of Ionosphere Characteristics. R12. Short Time Variations in Ionospheric Characteristics. R14. A Graphical Method for Calculating Ground Reflection Coefficients. R15. Predicted Limits for F2-layer Radio Transmission Throughout the Solar Cycle. R16. Predicted F2-layer Frequencies Throughout the Solar Cycle, for Summer, Winter, and Equinox Season. R17. Japanese Ionospheric Data—1943. R18. Comparison of Geomagnetic Records and North Atlantic Radio Propagation Quality Figures—October
1943 Through May 1945. R19. Nomographic Predictions of F2-layer Frequencies Throughout the Solar Cycle, for June. R20. Nomographic Predictions of F2-layer Frequencies Throughout the Solar Cycle, for September. R21. Notes on the Preparation of Skip-Distance and MUF Charts for Use by Direction-Finder Stations. (For
distances out to 4000 km.) R22. Nomographic Predictions of F2-layer Frequencies Throughout the Solar Cycle, for December. R23. Solar-Cycle Data for Correlation with Radio Propagation Phenomena. R24. Relations Between Band Width, Pulse Shape and Usefulness of Pulses in the Loran System. R25. The Prediction of Solar Activity as a Basis for Predictions of Radio Propagation Phenomena. R26. The Ionosphere as a Measure of Solar Activity. R27. Relationships Between Radio Propagation Disturbance and Central Meridian Passage of Sunspots Grouped
by Distance From Center of Disc. R28. Nomographic Predictions of F2-laye. Frequencies Throughout the Solar Cycle, for January. R30. Disturbance Rating in Values of IRPL Quality-Figure Scale From A. T. & T. Co. Transmission Disturb¬
ance Reports to Replace T. D. Figures as Reported. R31. North Atlantic Radio Propagation Disturbances, October 1943 Through October 1945. R32. Nomographic Predictions of. F2-layer Frequencies Throughout the Solar Cycle, for February. R33. Ionospheric Data on File at IRPL. R34. The Interpretation of Recorded Values of fEs. R35. Comparison of Percentage of Total Time of Second-Multiple Es Reflections and That of fEs in Excess of
3 Me. IRPL-T. Reports on tropospheric propagation:
Tl. Radar operation and weather. (Superseded by JANP 101.) T2. Radar coverage and weather. (Superseded by JANP 102.)
CRPL-T3. Tropospheric Propagation and Radio-Meteorology. WPG-5.)
(Reissue of Columbia Wave Propagation Group
•Items bearing this symbol are distributed only by U. S. Navy. They are issued under one cover as the DNC-14 series.
