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题名: The Effects of Solar Wind Dynamic Pressure Changes on the Substorm Auroras and Energetic Electron Injections on 24 August 2005
作者: Li, L. Y.; Wang, Z. Q.
作者部门: 空间科学部
通讯作者: Li, LY (reprint author), Beihang Univ, Sch Space & Environm, Dept Space Sci, Beijing, Peoples R China.
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN号: 2169-9380
出版日期: 2018
卷号: 123, 期号:1, 页码:385-399
收录类别: SCI
项目资助者: National Natural Science Foundation of China [41374165, 41504124, 41431071, 41074119] ; Specialized Research Fund for State Key Laboratories
英文摘要: After the passage of an interplanetary (IP) shock at 06: 13 UT on 24 August 2005, the enhancement (> 6 nPa) of solar wind dynamic pressure and the southward turning of interplanetary magnetic field (IMF) cause the earthward movement of dayside magnetopause and the drift loss of energetic particles near geosynchronous orbit. The persistent electron drift loss makes the geosynchronous satellites cannot observe the substorm electron injection phenomenon during the two substorm expansion phases (06: 57-07: 39 UT) on that day. Behind the IP shock, the fluctuations (similar to 0.5-3 nPa) of solar wind dynamic pressure not only alter the dayside auroral brightness but also cause the entire auroral oval to swing in the day-night direction. However, there is no Pi2 pulsation in the nightside auroral oval during the substorm growth phase from 06: 13 to 06: 57 UT. During the subsequent two substorm expansion phases, the substorm expansion activities cause the nightside aurora oval brightening from substorm onset site to higher latitudes, and meanwhile, the enhancement (decline) of solar wind dynamic pressure makes the nightside auroral oval move toward the magnetic equator (the magnetic pole). These observations demonstrate that solar wind dynamic pressure changes and substorm expansion activities can jointly control the luminosity and location of the nightside auroral oval when the internal and external disturbances occur simultaneously. During the impact of a strong IP shock, the earthward movement of dayside magnetopause probably causes the disappearance of the substorm electron injections near geosynchronous orbit.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6209
Appears in Collections:空间科学部_期刊论文

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