DOI: 10.1002/2017JA024628
Scopus记录号: 2-s2.0-85040732392
论文题名: 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.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 385
结束页码: 399
语种: 英语
英文关键词: changes in solar wind dynamic pressure
; compression auroras
; disappearance of substorm injection electrons
; drift loss of energetic particles
; movement of substorm auroral arc
; swing of entire auroral oval
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 (~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. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114776
Appears in Collections: 气候减缓与适应
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作者单位: Department of Space Science, School of Space and Environment, Beihang University, Beijing, China; Department of Space Science and Application, College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, China; State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Li L.Y.,Wang Z.Q.. The Effects of Solar Wind Dynamic Pressure Changes on the Substorm Auroras and Energetic Electron Injections on 24 August 2005[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)