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)

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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 Conclusion

Geomagnetic Field in 2235Variation of Dipole moment

Dip

ole

mom

ent

1022 Am2

Longitude

Lat

itu

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 　　　　　　　　　　　　　　 09/8

X-ray

Proton

Electron

S

NS

NS

NS

N

Daysideevening eveningnightside

?

?

00 　　　　　　　　　　　　　　　　　　　　　　　　 　 00 　　　　　　　　　　　　　　　　　　　　　　　　　 00 　　　　　　　　 　　　　　　　　　　　　　　　　　 24