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S outh America Riometer Network (SARINET) Kazuo Makita (Takushoku University, Japan ). We study upper atmosphere phenomena in South Atlantic Geomagnetic Anomaly ( SAGA) since 1997. So far, we installed several instruments at more than 10 stations in South America. - PowerPoint PPT Presentation
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NOAA data : >30keV electron
We study upper atmosphere phenomena in South Atlantic Geomagnetic Anomaly (SAGA) since 1997. So far, we installed several instruments at more than 10 stations in South America. Riometer / Imaging riometer is main equipment and named this riometer network observation as South America Riometer Network (SARINET). Recently we also installed Electric Field detectors at several points. We called this network observation as South America Field of Electricity Network (SAFENET).
South America Riometer Network (SARINET) Kazuo Makita (Takushoku University, Japan)
IGRF:2000
Southern Space Observatory ( SSO), INPE
Concepcion University, Chile
Imaging Riometer (IRIS) Stations in South America
29º42΄S, 53º11΄ W
36º50΄S, 73º01΄W
53º07΄S, 70º53΄W
43º15΄S, 65º22΄W
23º12΄S, 45º57΄ W
10º16΄S, 48º20 ΄ W
University Vale do Paraiba(UNIVAP)
University Luterano Brazil(ULBRA)
Magalhanes Univ., Punta Arenas , Chile
Geomagnetic Obs.(La Plata Univ.), Trelew, Argentina
Ionosphere(70km-300km)
Galaxy radio wave (f=38.2MHz)
Galaxy radio wave was absorbed by particle precipitation in ionosphere
Absorption image: 4 x 4(16) antennas
Imaging Riometer Observation
P
Cosmic Noise Absorption: CNAP
QDCCNA 10log10
Area :200km
Imaging riometer data at Southern Space Observatory
2001/03/27 GOES, A E, IRIS
IRIS at SSO (Keogram)
00 12 24
CNA event during Substorm
S
N
AE
Dst
Proton
Electron
Mag(Hp)
GOES
2011/09/22 09/23 09/24
SJC ( 23ºS)
SMR ( 30ºS)
TRW ( 43ºS)
PAC ( 53ºS)
00 00 00 24
X-ray
Proton
Electron
S
NS
NS
N
S
N
X-ray
NO CNATRW (43ºS)
SJC (23ºS)
S
N
S
N
X-ray
2011/09/24
Natal: 2013
South America 1ch and Imaging Riometer Network (SARINET)
CASLEO: Stop
Manaus: Stop
Imaging Riometer(6 stations+Kakioka)
1ch riometer (13 stations)
SJC(23.1S)
CASLEO(31.5S)
PAL(10.2S)
TRW(43.2S)
PAC(53.1S)
EACF(62.1S)
KAK(36.2N)
1ch Riometer data 2012 01 27 (00h-24h UT)
00 06 12 18 00
X-ray flare event
Installation of Field-Mill detector at 7 Stations in 2013
Palmas
AtibaiSan Jose dos CamposSanta Maria
Trelew
Punta Arenas
Field-Mill detector at SSO
Same Field Mill detectors are also installed at Kakioka Geomagnetic Ob. and Kagoshima college in Japan
Brazilian Antarctic Station (planning)
Calibration of Field-Mill detector for 6 stations
(1) E=200V/m corresponding ~ 1V output (AMP Gain: No. 7) (2) Sensitivity : E=2V/m corresponding ~ 10mV output
EACF Atibai ULBRA UNIVAP Trelew Kagoshima
Electric-Field Observation in South America
Riometer (Blue ) Electric Field (Red )
Magnetic H comp. (69.0S, 39.3E)
00 12 24 Magnetic field variation in Polar region has some relationships to Electric Field variation in Geomagnetic Anomaly region.(about 6 hours local time difference).
Is this relation true or not ?. We want to study this relationships.
+1V-1V
Syowa Station (Antarctica)
RIO/Electric-Field (29.6S, 54.0W)
Southern Space Obs.
(A) Particle precipitation influence in Geomagnetic Anomaly Region.(1) Ionization of neutral atmosphere (less than 50km) and Electric Field
will be produced between ionized region and ground. ionized atmosphere + + + + + + + +Electric-Field - - - - Ground - - -(2) Accelerate Electric Field may be detectable in Geomagnetic Anomaly region
as similar as aurora particle acceleration in the polar region. electronElectric Field + + +
(B) In the equatorial region, electric field of Plasma Bubble / Spread F phenomena Horizontal Component (Force of upward flow )
Detectable vertical Electric Field Total Electric Field
Possibility of Electric Field detection at the ground
Summary and ConclusionGeomagnetic Field in 2235Variation of Dipole moment
Dip
ole
mom
ent
1022 Am2
LongitudeL
atitu
de(1) Geomagnetic Field is sharply decreasing , especially in South Atlantic Ocean area.
(2) What influence will be happened under the week geomagnetic field condition ?.
(3) At present, the influence of environment due to decreasing of geomagnetic field is not so remarkable. However, it must be important to continue observation for the influence in South America region.
Thank you for your attention
SJC ( 23ºS)
SMR ( 30ºS)
TRW ( 43ºS)
PAC ( 53ºS)
2011/09/6 09/7 09/8X-ray
Proton
Electron
S
NS
NS
NS
N
Daysideevening eveningnightside
?
?
00 00 00 24