2014 Fiscal Year Final Research Report
Storm-time global geomagnetic field variation and ionospheric disturbance dynamo
| Project/Area Number |
23740369
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2014
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| Keywords | 磁気嵐 / 太陽風 / 電離圏電場 / 赤道エレクトロジェット電流 / 電離圏擾乱ダイナモ / 熱圏風 / 遮蔽電場 / 惑星間磁場 |
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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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| Free Research Field |
超高層大気物理学、プラズマ物理学、宇宙空間物理学、地球電磁気学
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