Details

Autor(en) / Beteiligte

• Zhou, Su
• Luan, Xiaoli
• Pierrard, Viviane
• Han, Desheng

Titel

Isolated Auroral Spots Observed by DMSP/SSUSI

Ist Teil von

• Journal of geophysical research. Space physics, 2019-11, Vol.124 (11), p.8416-8426

Ort / Verlag

Washington: Blackwell Publishing Ltd

Erscheinungsjahr

2019

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• This work reports auroral spots event observed by the SSUSI instruments on board the DMSP spacecraft between 22 and 23 July 2009 during the recovery phase of a moderate magnetic storm. The spots were observed between 18:00 and 02:00 magnetic local time and stayed at ~60° magnetic latitude. They lasted for ~10 hr and corotated with ~64% of the Earth's rotational speed. In situ observations indicate that the isolated auroral spots were produced by energetic ions at energies between 10 and 240 keV, with significantly anisotropic electron (30–300 keV) precipitations. It is expected that the energetic ions originate from the ring current and can be scattered by the EMIC waves through cyclotron resonance. The energetic electrons can be precipitated by the nonresonant interaction between the electrons and EMIC waves, which is suggested by previous works. Key Points The isolated auroral spots were produced predominantly by energetic ions (10–240 keV) and electrons (30–300 keV) The isolated auroral spots corotated with the Earth and lasted for ~10 hr The energetic ions related to the auroral spots were likely scattered by the EMIC waves and were mapped in the vicinity of the plasmapause