2014 Fiscal Year Final Research Report
Elucidation of magnetospheric convection mechanisms during northward interplanetary magnetic field periods
Project/Area Number |
24540479
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Space and upper atmospheric physics
|
Research Institution | Kyushu University |
Principal Investigator |
|
Project Period (FY) |
2012-04-01 – 2015-03-31
|
Keywords | シータオーロラ / 沿磁力線電流 / プラズマ対流 / 磁気圏ダイナモ |
Outline of Final Research Achievements |
Using global numerical simulation, we elucidated the theta aurora formation processes when the dawn-dusk component of the interplanetary magnetic field switches. There appears a unipolar field-aligned current system on the theta aurora. In the magnetospheric source region of the currents, expanding slow mode disturbances convert plasma thermal energy to electromagnetic energy to maintain the steady state field-aligned current system. This energy conversion process represents the essential mechanism of the magnetospheric dynamo in general, not just limited to the theta aurora.
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Free Research Field |
磁気圏物理学
|