Unified Theory of the Arc Auroras: Formation Mechanism of the Arc Auroras Conforming General Principles of Convection and FAC Generation

T. Tanaka, M. Watanabe, Y. Ebihara, S. Fujita, N. Nishitani, R. Kataoka

研究成果: ジャーナルへの寄稿学術誌査読

3 被引用数 (Scopus)

抄録

The arc aurora can be considered as the visualization of the field-aligned current (FAC). In various cases, the numerically reproduced FAC morphologically matches well with that of the observed arc aurora. Such example can be seen in the sun-aligned arc, the fan arc, and the theta aurora under the northward interplanetary magnetic field (IMF), and the substorm, the quiet arc, and the initial brightening under the southward IMF. The FAC reproduced by the global simulation is based on the general principle of the magnetohydrodynamic (MHD). In such general principle, the FAC is transmission of net charge, net charge is divE, and E is equivalent to motion. After all, the FAC is transmission of convection motion. In order to transmit the FAC to the dissipative ionosphere based on the MHD, formations of the dynamo and shear that leads from the magnetosphere to the ionosphere are essential. The dynamo and shear are reproduced so as to properly match with each convection structure. The comparison under various magnetospheric topologies between the global simulation and the arc aurora observation indicates that the arc aurora and the FAC occurs inevitably controlled by convection structure. Such a principle of the FAC and convection holds even for the onset FAC.

本文言語英語
論文番号e2022JA030403
ジャーナルJournal of Geophysical Research: Space Physics
127
9
DOI
出版ステータス出版済み - 9月 2022

!!!All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 宇宙惑星科学

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