| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
In the present study, we analyzed geomagnetic field data obtained from geomagnetic observatories distributed from both the poles and equator together with solar wind data in order to investigate the characteristics of global geomagnetic field and thermospheric wind variations during geomagnetic storms. As a result, during the main phase of geomagnetic storm caused by southward turning of the interplanetary magnetic field (IMF), the region-1 type of ionospheric currents were developed from the polar to middle-latitude regions and the eastward equatorial electrojet (EEJ) current on the dayside was intensified due to penetration of the polar ionospheric electric field to the equator. On the other hand, during the recovery phase of geomagnetic field caused by northward turning of the IMF, the region-2 type of ionospheric currents appeared in the middle-latitude regions. Moreover, the westward EEJ current driven by the region-2 electric field was developed on the dayside during this period.
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