Solar-geophysical data

Library, N.W. Bldg

I SEP 4 1964 |

CRPL-F 240 PART B

PART B

SOLAR - GEOPHYSICAL DATA

ISSUED

AUGUST 1964

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taken from the FOR OFFICIAL USE

U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS

CENTRAL RADIO PROPAGATION LABORATORY BOULDER, COLORADO

CRPL-F 240

PART B

NATIONAL BUREAU OF STANDARDS CENTRAL RADIO PROPAGATION LABORATORY

BOULDER, COLORADO

Issued 31 Aug. 196

SOLAR-GEOPHYSICAL DATA

CONTENTS

I DAILY SOLAR INDICES

(a) Relative Sunspot Numbers and 2800 Mc/s Solar Flux - June - July 1964

(b) Graph of Sunspot Cycle

II SOLAR CENTERS OF ACTIVITY

(a) Calcium Plage and Sunspot Regions - July 1964

(b) Magnetic Classifications of Sunspots (Mt. Wilson) - July 1964

(c-e) Final Coronal Line Emission Indices - April - May - June 1964

(f) Provisional Coronal Line Emission Indices - July 1964

III SOLAR FLARES

(a-c) Optical Observations - July 1964

(d) Flare Patrol Observations - July 1964

(e-g) Optical Observations - April 1964

(h) Flare Patrol Observations - April 1964

(i) Optical Observations - January - February - March 1964

(j) Ionospheric Effects (SWF-SEA-SCNA-SPA-SES-SFD-Bursts) - June 1964

(k) 26 Mc/s - Riometer Events (South Pole) - June 1964

IV SOLAR RADIO WAVES

(a) 2800 Mc/s Outstanding Occurrences (ARO-Ottawa) - July 1964

(b) 169 Mc/s Interferometric Occurrences (Nancay) - July 1964

(c) 108 Mc/s Outstanding Occurrences (NBS-Boulder) - July 1964

(d-f) 50-320 Mc/s (Fort Davis) - April - May - June 1964

(g) 7.6-41 Mc/s Spectral Observations (HAO-Boulder) - July 1964

(h-m) 9.1 cm Spectroheliograms (Stanford) - July 1964

V COSMIC RAY INDICES

(a) Climax Neutron Monitor - June 1964

(b) Deep River Neutron Monitor - June 1964

VI GEOMAGNETIC ACTIVITY INDICES

(a) C, Kp, Ap and Selected Quiet and Disturbed Days - June 1964

Co) Chart of Kp by Solar Rotations - 1964

VII RADIO PROPAGATION QUALITY INDICES

(a) CRPL Quality Figures and Forecasts - North Atlantic and

North Pacific - June 1964

(b) Graphs Comparing Forecasts and Observed Quality - North Atlantic and

North Pacific - June 1964

(c-d) Graphs of Useful Frequency Ranges - North Atlantic - June 1964

VIII ALERT PERIODS AND SPECIAL WORLD INTERVALS

(a) IQSY Alert Periods - July 1964

The descriptive text was republished November 1963

Addendum to text:

ADJUSTMENT IN THE 10.7 CM SOLAR NOISE OBSERVATIONS

FOR VARIATIONS IN THE SUN-EARTH DISTANCE

The solar radio noise as observed and reported at Ottawa on a

wavelength of 10.7 cm, is a measure of this radiation incident on the

earth for a particular day. For geophysical studies the use of the

observed flux is appropriate, but as an indication of intrinsic or

absolute solar activity, it must be modified for the varying distance

between sun and earth. The most suitable adjustment is that which

places the sun at unit astronomical distance. As a guide for follow¬

ing small changes of radio emission during the IQSY, daily values of

the flux adjusted to 1 Astronomical Unit will be reported in addition

to the observed values. This measure consists of emissions from the

undisturbed solar atmosphere and from any centers of activity. The

intensity of the outstanding events will be reported as before.

Recent considerations of the significance of the annual varia¬

tion of the sun-earth distance have already appeared in geophysical

studies [l,2]. Monthly adjusted means for the first part of 1964 are

given in Table I and are to be compared with the minimum value of

65.5 flux units which occurred in January 1954.

A. E. Covington

July, 1964

TABLE I

72.0

74.3

74.8

73.0

70.7

71.3

January

February

March

April

May

June

On the World Wide Component of Variations in the E-Layer

Ionization, T. Shimazaki, Jour. A and T Physics 1963,

Vo 1. 25, pp. 331 to 337.

Effect on the Earth's Orbital Eccentricity on Incident Solar

Flux at 10.7 cm, M. K. Das Gupta and D. Basu, Jour. A and T

Physics 1964, Vol. 26, pp. 135 to 137.

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Ia DAILY SOLAR INDICES

June 1964

American Relative Sunspot Numbers

Ra1

1 li 2 n 3 10 4 6

5 0

6 0 7 0 8 0

9 0 10 0

11 4 12 2 13 13 14 16 15 25

16 14 IT 10 18 24 19 22 20 6

21 0 22 0 23 0 24 0 25 0

26 0 27 0 28 0 29 4 30 5

Mean: 6.1

July 1964

Zurich Provisional Relative Sunspot

Numbers

RZ

Daily Values Solar Flux at 2800 Me, Ottawa, Canada

Flux s sA

1 7 67.4 69.7 2 0 67.0 69.3

3 0 67.3 69.6 4 8 68.1 70.4

5 10 67.6 69.9

6 8 67.8 70.1 7 7 67.0 69.3 8 0 67.9 70.2

9 0 67.1 69.4 10 0 66.6 68.9

11 7 67.6 69.9 12 0 66.9 69.1 13 0 66.5 68.7 14 10 69.2 71.5 15 12 69.5 71.8

16 11 69.2 71.6 17 9 68.6 70.9 18 8 68.0 70.2 19 0 67.4 69.6 20 0 66 .6 68.8

21 0 66 .4 68.5 22 0 66.1 68.2 23 0 66.4 68.5 24 0 66.1 68.2 25 0 65.8 67.9

26 0 64.8 ** 66.9 27 0 65.3 67.3 28 0 65.4 67.4 29 0 65.9 67.9 30 0 66.2 68.3 31 7 66.2 68.2

Mean; 3.4 67.0 69.2

** July 26, 1964: Lowest flux observed since 1954.

COMMERCE STANDARDS BOULDER

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Ha CALCIUM PLAGE AND SUNSPOT REGIONS

JULY 1961

July

1964

LAI. MCMATH PLAGE

NUMBER

RETURN OF

REGION

CALCIUM PLAGE DATA SUNSPOT DATA CMP VALUES HISTORY AGE

(ROTA¬ TIONS)

DATE FIRST SEEN

(1)

DURA¬ TION (OATS)

CMP VALUES HISTORY AREA INT AREA COUNT

3.8 S37 7385 (2) New 200 2 b - d i July 5 1

4.7 S02 7383 New 400 2 £ “\ d i June 28 S10 (20) (1) £ - d

5.4 N24 7390 New (300) (1.5) b - £ i Ju ly 10 1

6 .0 S09 7391(2) New (200) (1) b — £ i July 10 1

8.1 N05 7386 (2) New 200 1.5 b d i July 6 1

8.3 S05 7392 (2) New (100) (2) b — d i July 10 1

8.7 S14 7393 (2) New (100) (1.5) b — d i July 10 1

9.0 N05 7394(2) New 100 1 b — d i July 10 1

9.3 N32 7384 7343 900 3 £ “\ £ 2 July 2 14 (60) (l) b \ d

9.3 N45 7387 New 100 1.5 b d 1 July 9 2

9.7 NO 2 7400 New (100) (2.5) b — d 1 July 13 2

10.1 S06 7401 New (100) (1.5) b — d 1 July 13 2

11.7 NO 7 7388(3) 7357 500 2 b “\ d 2 July 6 10

12.1 N14 7406 New (300) (1.5) b — £ 1 July 16 2

12.2 N29 7395 (2) New 200 2 b — d 1 July 10 1

12.4 S02 7397(2) New 200 1 b — d 1 July 11 1

13.4 N30 7389 New 300 1.5 b — d 1 July 9 3

13.9 Sll 7402 New 200 1.5 b — d 1 July 14 3

14.8 NO 7 7403 New 200 2 b — d 1 July 14 5

14.9 N10 7396 (2) New (100) (1) b — d 1 July 10 1

15.0 N29 7398 New 200 2.5 b — d 1 July 11 3

16.4 N2 9 7407 New 200 2 b “\ £ 1 July 16 6

16.9 N18 7408 New 100 2 b - d 1 July 17 2

17.5 SOI 7399 New 200 1.5 £ ~\ d 1 July 11 6

17.7 N28 7404 New 400 3 b £ 1 July 14 10 70 3 b A d

20.5 N10 7409 New (300) (1) b - d 1 July 23 2

21.2 NO 8 7405 New (400) (1) £ d 1 July 15 4

22.3 N3 7 7410 New 100 1.5 b - £ 1 July 23 5

23.5 N15 7418 (2) New (200) (2) b - £ 1 July 28 1

24.2 S09 7411(2) New 200 2 b — d 1 July 24 1

24.7 N18 7415 (2) New (200) (2.5) b _ d 1 July 27 1

25.5 N06 7416 (2) New (400) (1.5) b — d 1 July 27 1

25.6 S06 7419 New (100) (1) b - d 1 July 28 2

26.9 S15 7417(2) New 100 2 b — d 1 July 27 1

27.4 S05 7420(2) New 200 1.5 b d 1 July 28 1

28.1 Nil 7421 New 100 1 b — d 1 July 28 2

28.1 S08 7424 New (100) (1) b — d 1 July 30 4

28.5 N21 7425 New (300) (3) b £ 1 July 31 4 (100) (2) b — d

28.6 N21 7422 (2) New 100 1.5 b - d 1 July 28 1

29.3 N15 7412(2) New (200) (1) b — d 1 July 24 1

30.9 N32 7413 New (200) (1.5) £ _ d 1 July 24 2

31.1 NO 8 7426 New (200) 3 b s £ 1 Aig. 1 6 (100) (1) b— d

31.3 NO 3 7414 New (300) (1.5) & d 1 July 25 4

(1) No calcium plage observations were secured at the McMath-Hulbert Observatory on July 8, 1964.

(2) These very small and ephemeral plages last for only one day.

(3) Plage 7388 was seen on the disk as a weak plage on July 6 and the days following, but was not

reported until July 9.

MT. WILSON MAGNETIC CLASSIFICATIONS OF SUNSPOTS lib

JULY 1961

TIME LAT MER TYPE TIME LAT MER TYPE July MEAS DIST July MEAS DIST 1964 UT 1964 UT

1 0005 S05 E46 aP 13 No Obs.

1 1450 S05 W37 Op 14 1745 N2 7 E37 Pp*

2-3 No Spots 15 1630 N27 E26 Pp*

4 1730 N28 E56 Pp 16 1645 N17 W57 af

N28 E13 Pp* 5 1810 N29 E43 Pp

17 1800 N28 W02 CTp*

6 1635 N29 E27 af 18 No Obs.

7-8 No Spots

19-30 No Spots

9 No Obs.

31 1815 N19 W30 Pp* 10-12 No Spots

COMMERCE - STANDARDS - BOULOER

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Erratum: In CRPL-F 239B for July 1964, the Mt. Wilson data published on page lib,

the latitude and longitude columns have been reversed.

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PROVISIONAL JllIA 1961

OBSERVATIONS uid

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Observatories included:

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Capri-S (Swedish)

Catania

Duns ink

Haute-Provence

Huancayo

Ikomason

Istanbul

Locarno

Lockheed

Manila

McMath-Hulbert

Mitaka

Ondrejov

Ottawa

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19

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22

23

24

25

26

27

28

29

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INTERVALS OF NO FLARE PATROL OBSERVATIONS

APRIL 1964

11 111

HOUR-UT

I 2 3 4 5 6 7 8 9 10 I I 12 13 14 15 16 17 18 19 20 21 22 23 24

HH

il IS

. imi

COMMERCE - STANDARDS

bservatories included:

bastumani

rcetri

rosa

ucharest

apetown

apri-F(German)

Capri-S (Swedish)

C Umax

Crimee

Duns ink

Haute-Provence

Herstmonceux

Honolulu

Ikomasan

Irkutsk

Istanbul

Izmiran

Kiev-KO

Kodaikanal

Locarno

Lockheed

Lvov

Manila

McMath-Hulbert

Mitaka

N izamiah

Ondrejov

Ottawa

Sacramento Peak

Sydney

Tachkent

Ucc le

Voroshilov

WendeIstein

Wroclaw

Zurich

J AM

A in

nil

co w «

< -J lU

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s

are

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tho

se

pu

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in

CR

PL

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234,

235,

236,

237,

23

8

and

239 P

art

B

for

Febru

ary

, M

arc

h,

Apri

l,

May

, Ju

ne

and July

1964.

IONOSPHERIC EFFECTS OF SOLAR FLARES nij

SHORT WAVE RADIO FADEOUTS SUDDEN PHASE ANOMALIES SUDDEN COSMIC NOISE ABSORPTION SUDDEN ENHANCEMENTS OF SIGNAL

SUDDEN ENHANCEMENTS OF ATMOSPHERICS SUDDEN FREQUENCY DEVIATIONS SOLAR NOISE BURSTS AT 18 Mc/s

JINK !*)(>!

WIDE SPREAO

BUR INOEX

JUNE UNIVERSAL TIME TYPE

I96A - owr SES START END MAX IMP ABS SCNA SEA SPA

IMPORTANCE STATIONS

KNOWN FLARE

None observed.

compact STANDARDS soot. OCA

11 lk RIOMETER EVENTS

( Provisional)

JUNE 1964

South Pole 26 Me/s

JUNE

1964

START

UT

END

UT

MAX.

UT

MAX.

ABSORR db ,

(tenths)

NO.

OF

PEAKS

JUNE 1964

START

UT

END

UT

MAX

UT

MAX. ABSORP

db, (tenths)

NO.

OF

PEAKS

1 1218 2053 1618 9 5 17 0328 0412 0400 5 1 2 0127 1925 0952 5 4 17 1441 1602 1514 3 2

3 1009 1504 1129 3 1 18 0306 0348 0317 6 1 4 0849 1150 0949 5 2 18 1133 1500 1418 4 2

5 0227 0436 0247 14 1 18 2208 2342 2216 10 2

6 0929 1633 1056 4 6 19 2315 0616 2353 6 4

7 /V 20 1106 1221 1146 4 1

8 0203 0307 0231 3 4 21 0105 0316 0112 30 3 8 0905 1246 0923 7 1 21 0952 1314 1134 4 2

9 0154 1649 1217 4 16 22 1406 1832 1643 5 3

10 0129 0413 1205 26 5 23 0549 1729 1408 7 6

11 0756 1826 1432 6 3 23 2218 0154 2348 28 1

12 0228 iWc 0236 54 0 24 2014 2128 2107 5 2

13 0020 0224 0115 27 3 25 0017 1811 0028 38 2

13 0638 1946 1112 28 2 26 0054 0326 0205 41 1

13 2150 2317 2232 3 2 26 0852 0300 2322 41 1

14 0452 0632 0530 11 1 27 0730 1809 1434 12 13

14 0850 1818+ 0031+ 13 3 27 2143 2335 2244 5 2

16 0101 0746 0128 27 1 28 1012 1358 1130 22 1 28 1833 1845 1837 4 2

29 0941 0427 1206 14 1 30 1752 033$ 0149 15 2

COMMERCE - STANDARDS - BOULDER

* No event ** Uncertain + June 15, 1964

SOLAR RADIO EMISSION

OUTSTANDING OCCURRENCES

IVa

JULY 1%1

ARO-OTTAWA 2800 Me/s

JULY

U R A N E

DESCRIPTIVE START DURATION MEAN MAXIMUM

REMARKS 1964 TYPE UT HRS. MIN. FLUX

TIME FLUX

None observed.

COMMERCE STANOAROS BOULDER

SO

LA

R

RA

DIO

EM

ISS

ION

INT

ER

FE

RO

ME

TR

IC

OB

SE

RV

AT

ION

S

IVb

O LU

JUL

Y 1

964


OUTSTANDING OCCURRENCES

IVc

JULY 1961

NBS BOULDER 108 Mrs

NOMINAL TIMES OF OBSERVATION

JULY 1964

NBS BOULDER 108 Me s

1964 July

HOURS OF OBSERVATION

U.T.

HOURS OF INTERFERENCE

U.T. July 1964

HOURS OF OBSERVATION

U.T.

HOURS OF INTERFERENCE

U.T.

1 1140-1618; 16 1149-2302 1645-0210 17 1150-0206 2355-0111

2 1140-1245; 18 1151-0205 1300-0210 1755-2045 19 1152-2150;

3 1141-0209 2203-0204 4 1141-0209 2150-2235; 20 1152-0204

2335-2400 5 1142-0209 2040-2205; 21 1153-0203 2313-0000

2345-0058 22 1154-0202 1444-1447; 1824-2224

6 1142-0209 1924-1940; 23 1155-0201 2103-2230 2009-2012 24 1156-0201

7 1143-0208 25 1157-0200 0032-0200 8 1144-0208 2004-2025;

2147-2250 26 1157-0159 9 1144-0208 2330-0130 27 1158-0159

10 1145-0207 28 1159-0127 2213-0127 29 1550-0157 1947-0157

11 1145-0208 2300-2330 30 1201-0156 1748-1830; 12 1146-0207 2352-0010 13 1147-0207 2145-2225;

0130-0145 31 1202-0155 1330-1332; 14 1148-1629; 2342-0028

1644-0207 15 1148-2302 2120-2302

Note: Most of the interference is due to atmospherics


IVd SOLAR RADIO EMISSION SPECTRAL OBSERVATIONS

APRIL 1964

Fort Davis 50-320 Mo/s

196 4 IMPORTANT BURSTS

FREQUENCY RANGE

MG TYPE TIMES

U. T INT

Apr. 1 1305-2300

Apr. 2 1305-2300

Apr. 3 1306-2300

Apr. 4 1305-2300

Apr. 5 1306-2300

Apr. 6 1305-2300

Apr. 7 1305-2300

Apr. 8 1306-2300

Apr. 9 1305-2300

Apr. 10 1305-2300

Apr. 11 1305-2300

Apr. 12 1305-2300

Apr . 13 1305-2300

Apr . 14 1305-2300

Apr. 15 1306-2130 2132-2300

Apr. 16 1306-2300

Apr. 17 1306-2300

Apr. 18 1307-2300

Apr. 19 1306-2300

Apr. 20 1307-2300

Apr. 21 1307-2300

Apr. 22 1307-2300

Apr. 23 1307-2300

Apr. 24 1307-2300

Apr. 25 1307-2300

Apr 26 1254-2300

Apr 27 1254-2300

Apr 28 1645-2300

Apr 29 1300-2300

Apr 30 1301-2300

CO***RC£

SOLAR RADIO EMISSION SPECTRAL OBSERVATIONS

M U 1961

Fort Davis 50-320 1Y1<

196 4 OBSERVING HOURS

May 1 1300-2300

May 2 1300-2300

May 3 1300-2300

May 4 1300-2300

May 5 1300-2300

May 6 1301-2300

May 7 1300-2300

May 8 1300-2300

May 9 1300-2300

May 10 1300-2300

May 11 1300-1619 1845-2300

May 12 1300-2300

May 13 1300-2300

May 14 1300-2300

May 15 1300-2300

May 16 1300-2300

May 17 1300-2300

May 18 1301-2300

May 19 1301-2300

May 20 1300-2300

May 21 1300-2300

May 22 1300-2300

May 23 1300-2300

May 24 1300-2300

May 25 1300-2300

May 26 1300-2300

May 27 1300-2300

May 28 1300-2300

May 29 1300-2300

May 30 1300-2300

May 31 1300-2300

MPORTANT BURSTS FREQUENC

RANGE

IVe

STANDARDS BOULDER

IVf SOLAR RADIO EMISSION

SPECT R A L O BS ERVAT1 ON S

Jl \l I'll, I

Fort Davis 50-320 Mc/s

1964

June I

June 2

June 3

June 4

June 5

June 6

June 7

June 8

June 9

June 10

June 11

June 12

June 13

June 14

June L5

June lb

June 17

June 18

June 19

June 20

June 21

June 22

June 23

June 24

June 25

June 26

June 27

June 28

June 29

June 30

OBSERVING HOURS IMPORTANT BURSTS

FREQUENCY

RANGE

MC

REMARKS

TYPE TIMES U.T

INT

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1507-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-1955 2004-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

1230-2230

COMMERCE - STANDAROS BOULOER


SPECTRAL OBSERVATIONS

JULY 1964

High Altitude Observatory Boulder 7.6-41 Mc/s

Date

July 1964

Bursts

Freouency

Fange (Mc/s)

Type Time (U.T.) Inten¬

sity

7 III 1420:30-1421:50 1+ 19-41

COMMERCE - STANDARDS - BOULDER

SO

LA

R

RA

DIO

EM

ISS

ION

SP

EC

TR

OH

EL

IO G

RA

M S

JU

LY 1964

SO

LA

R

RA

DIO

EM

ISS

ION

SP

EC

TR

OH

EL

IOG

RA

MS

SO

LA

R

RA

DIO

EM

ISS

ION

SP

EC

TR

OH

EL

IO G

RA

MS

JU

LY 1

96

4

SO

LA

R

RA

DIO

EM

ISS

ION

SP

EC

TR

OH

EL

IO G

RA

MS

JU

LY 1

96

1

Tota

l =

39

84

SO

LA

R

RA

DIO

EM

ISS

ION

SP

EC

TR

OH

EL

IO G

RA

MS

JU

LY 1

96

4

a eci O (Jh

Z < h c/5

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LA

R

RA

DIO

EM

ISS

ION

SP

EC

TR

OH

EL

IO G

RA

MS

Va COSMIC RAY INDICES

(Climax Neutron Monitor)

IGC Station II 305

JUNE 1964

June 1964

DAILY

AVERAGE

COUNTS / HOUR* June 1964

0A1LY

AVERAGE

COUNTS / HOUR*

1 3289.0 16 3282.4 ** 2 3287.1 17 3299.9 ** 3 3289.6 18 3298.0 ** 4 3286.4 19 3287.8 5 3293.2 20 3296.4 ** 6 3305.3 21 3288.3 ** 7 3314.6 22 3269.2 ** 8 3304.5 ** 23 3270.7 ** 9 3276.6 24 3274.7

10 3287.7 ** 25 3285.0 11 3290.7 26 3287.7 12 3281.3 27 3286.2 13 - _ 28 3289.3 14 3293.7 ** 29 3291.3 ** 15 3286.2 30 3279.1

COMMERCE - STANOAROS - BOULDER * Scaling Factor 128

** No. of Section Hours Less Than 40.

CO

SM

IC

RA

Y

IND

ICE

S

Vb

CO

MM

ER

CE

- S

TA

ND

AR

DS

- B

OU

LD

ER

Via GEOMAGNETIC ACTIVITY INDICES

JUNE 1964

June 1964

C Values Kp

Sura Ap Final

Selected Days

Three 1 2

hour Gr. interval 3 4 567 8

1 0.3 0+ 1+ lo lo 2o 2- lo 2- lOo 5 Five 2 0.2 1- lo lo 1- 1+ 1+ 1+ lo 8+ 4 Quiet

3 0.2 lo 1+ 1- lo lo 0+ 0+ lo 7- 4

4 0.2 2- 1- 1+ 1+ lo 2- lo 1- 9+ 4 3

5 0.1 1- 1- 0+ 1- 1- lo lo 0+ 5+ 3 5

6 0.1 0+ lo 1- 2- 2o 0+ 0+ 1- lo 4 D

16

7 0.3 0+ 0+ 0+ 0+ lo 0+ 3- 3o 8+ 5 30

8 0.5 3- 2+ 3o 3- 2- lo 2- 1+ 16+ 9

9 0.6 2- 2- 2- 2o 3- 3o 2- 1+ 16- 8

10 1.5 3- 7- 6+ 6- 5o 3o 3+ 4o 37- 49

11 1.2 5- 5- 3+ 4- 3+ 4o 3- 4- 30o 25 Five 12 0.8 3o 3- 2+ 3o 3o 3o 2o 3- 22- 12 Disturbed

13 0.7 3- 3- 2+ 3o 2- 2o 2- 2o 18 0 9 14 0.4 1+ 2+ 2+ 2- 2- lo 2- 2+ 14+ 7 10

15 0.3 3o 2o 1+ lo lo 1+ lo 2- 12+ 6 11 12

16 0.1 2- lo 1- lo 0+ lo lo lo 8- 4 20

17 0.1 0+ 1+ 2- lo 2- 1- 0+ 0+ 7+ 4 21 18 0.5 1- 0+ 1- 2o 3o 1+ 2+ 3- 13 0 7

19 0.3 1- 0+ 0+ 1+ 1- lo 2- 3- 9- 5 20 0.9 3- 3- 2- 3- 5o 3o 4- 2- 23o 17

21 0.8 4o 2- 3- 3+ lo 2- 3o 0+ 18- 11 Ten 22 0.4 0+ 1- 0+ lo 2- 3- 2o 2o 11- 5 Quiet

23 0.4 2- 1+ 1+ 2- 2o 1+ 1+ 2+ 13o 6 24 0.3 2- 1- 1- 0+ 1- lo 3o 2o lOo 5 1 25 0.6 2+ 3+ 4o 2+ 2o lo 1+ lo 17+ 10 2

Q

26 0.4 lo 2- 2o 2- 2- 1+ 1- 1+ 11+ 5 J 4

27 0.3 0+ 0+ lo lo 2+ 2o 2- 2o 11- 5 5 28 0.7 1- 1+ 1+ 2+ 3+ 4- 3+ 1+ 17+ 11 6 29 0.4 1+ 1+ 2- 3- 1+ 2+ 1+ Oo 12o 6 16 30 0.1 1- 2- 0+ 1- 1- 0+ lo lo 6+ 3 17

19 30

Mean; 0.46 Mean: 9


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4 43 r— 4 43 r— 4 p 43 43 43 lt \ 43 4) 43 4> 43 p 4) 4 43 4) p 43 43 43 43 43 43 43

43 4) 4) 43 4) 43 4) 43 4) 43 43 4 4 4 P P P P 4 4 4 4 4 4 P 4 P 4 4 4

4 4 p p p n n 4) 43 4 4343434343 1— r— r^- r— 4> 4341434343 n n 4) 4 4)

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P P P 4

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P P P P 4

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CRPL RADIO PROPAGATION QUALITY FIGURES AND FORECASTS VII b

NORTH ATLANTIC

OUTCOME OF ADVANCE FORECASTS--FINAL ESTIMATES (I TO 7 DAYS AHEAD)

NORTH ATLANTIC

QUIET

P

S

u

F

NORTH PACIFIC

K QUIET

actual

COMPARISON (SEE TEXT)

P

S

u

F

0 COMMERCE STANDARDS BOULDER

■no

mam

o

Vile USEFUL FREQUENCY RANGES ~ NORTH ATLANTIC PATH

.11 M. 1964


USEFUL FREQUENCY RANGES ~ NORTH ATLANTIC PATH Vlld

,li m: mi

OhUT 3 6 9 12 15 18 21 24 CfuT 3 6 9 12 15 18 21 24

Adapted from Observations by Deutsches Bundespost

Villa IQSY ALERT PERIODS

INTERNATIONAL LRSIGRAM AND WORLD DAYS SERVICE

JULY 1961

JULY

1964

TIME

OF ISSUE

UT

WORLDWIDE GEOPHYSICAL ALERT

ADVANCE GEOPHYSICAL ALERT

NO. TYPE TIMING ELABORATION

6 0400 81 Magnetic Storm Expected



16 0400 84 Magnetic Calm Exists

23 0400 85 Solar Calm Exists









CO**JERC£ - STANDARDS BOULDER

Documents

Solar-geophysical data