Large amplitude electromagnetic fluctuations in the inner plasma sheet region observed by the Akebono satellite

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We studied large amplitude electromagnetic fluctuations in the inner plasma sheet using magnetic field, electric field, and particle data obtained from the Akebono satellite. Only five large amplitude electromagnetic fluctuation events are found in the Akebono data set obtained in January and February 1990. These events occurred around 65°invariant latitude, having a narrow 〜1 deg.) latitudinal width. In association with these fluctuations, field-aligned electrons and upward flowing ions are observed. The ground magnetic field variations near the satellite footpoint shows intensification and fluctuation of the westward electrojet during these events. Further, from the analysis of the amplitude and phase relationship between electric and magnetic fields, we conclude that these events are caused by superposition of incident and reflected Alfven waves or traveling Alfven waves. Our data analysis suggest that these large amplitude events are a transient process originating in the near-earth magnetotail region. It is possible that the energy source of this event is related to the substorm current system.
国立極地研究所の論文