@article{oai:nipr.repo.nii.ac.jp:00010279,
 author = {田中, 髙史 and Tanaka, Takashi},
 issue = {2},
 journal = {南極資料, Antarctic Record},
 month = {Jul},
 note = {P(論文), 最近のグローバルシミュレーションで，観測されるサブストームの主要変動はほとんど再現可能となり，数値解はかなりの信ぴょう性を持つに至った．解はグローバルな磁場プラズマ構造をすべて保持しており，サブストームの力学を解明する強力なデータとなる．サブストームは，不安定，異常抵抗，リコネクションなど，磁気圏プラズマの異常過程の現れと信じられてきたが，数値解の解析結果ではこれは誤りであり，サブストームは対流の発展及び変動として理解されることが示される．その理解には，対流を駆動するエネルギー変換，FAC（field-aligned current: 沿磁力線電流）の生成機構（ダイナモ）が重要となる．すべてのFACは磁化電流から生成され，region 1 FACのダイナモはカスプ-マントル領域に，region 2 FACのダイナモはプラズマシートにあり，これらの構造はサブストームの場合でも変わらない．オンセットでは，状態遷移により内部磁気圏の圧力領域が強化される．, It has been believed that the substorm is a manifestation of extraordinary plasma processes in the magnetosphere, such as instability, anomalous resistivity, and reconnection. In this paper, we show that this belief is a misleading concept and that the substorm must be understood as the development and transition of the convection system. Major observed signatures of the substorm have all become reproducible by the recent magnetosphere-ionosphere (M-I) coupling simulation. In order to understand the substorm as a change in convection system, we first study from these numerical solutions the energy conversion driving the convection and field-aligned current (FAC), namely the formation process of the dynamo. The dynamos for the region 1 and region 2 FACs are formed in the cusp-mantle region and inside the plasma sheet, respectively, and are driven by the expanding slow mode. These structures are unchanged even in the substorm case. The substorm onset is attributed to the phase space transition in the convection system, caused by a change in force balance in the plasma sheet. This process results in the formation of high-pressure region in the inner magnetosphere and an accompanying rapid increase in the region 2 FAC to cause the onset.},
 pages = {108--149},
 title = {サブストームの研究：第2編：対流の発達によるサブストームの発生},
 volume = {58},
 year = {2014},
 yomi = {タナカ, タカシ}
}