| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Research Abstract |
The field variations during geomagnetic storms are produced by both the magnetospheric currents such as the ring current and the induced currents inside the Earth’s interior. Previous studies have reported that the magnetic field variations due to the induced currents are about 25% of the Dst index; but we found that the Earth-induced current contribution varies between 20% and 55%, and depends on the rate of change of the Dst index. With regard to ring current development, we suggest that the non-adiabatic acceleration of preexisting cold ions by magnetic fluctuations associated with dipolarization plays a more important role than the energetic particle injection from the plasma sheet into the inner magnetosphere.
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