Occurrence conditions for two different kinds of transpolar arcs

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概要

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• On the basis of DMSP auroral image and particle data, the occurrence conditions of sun-aligned arcs and theta auroras are examined for various solar wind conditions. Sun-aligned arcs appear during geomagnetically quiet period and also the period of northward IMF associated with high solar wind velocity. Theta auroras appear during the period of moderate geomagnetic activity and also extremely high solar wind velocity. However, IMF B_z is not always positive when theta auroras appear. These results may suggest that the source of sun-aligned arc and theta aurora are quite different.

• 国立極地研究所の論文

著者

• Makita Kazuo

  Faculty Of Engineering Takusyoku University

• Meng Chin-I

  Applied Physics Laboratory, The Johns Hopkins University

• Meng Chin-i

  Applied Physics Laboratory The Johns Hopkins University

関連論文

• Occurrence conditions for two different kinds of transpolar arcs
• Polar cap arcs and their relationship to IMF and geomagnetic activity

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