DOI: 10.1002/2014GL061794
论文题名: Asymmetric braking and dawnward deflection of dipolarization fronts: Effects of ion reflection
作者: Zhou X.-Z. ; Angelopoulos V. ; Liu J. ; Runov A. ; Pan D.-X.
刊名: Geophysical Research Letters
ISSN: 0094-9675
EISSN: 1944-9406
出版年: 2014
卷: 41, 期: 20 起始页码: 6994
结束页码: 7001
语种: 英语
英文关键词: dawn-dusk asymmetry
; DF deceleration
; DF deflection
; dipolarization front
; dynamic pressure
; ion reflection
Scopus关键词: Deflection (structures)
; Plasma sheaths
; Acceleration process
; Asymmetric reaction
; dawn-dusk asymmetry
; Dipolarization
; Dynamic pressures
; Earth's magnetotail
; Near-Earth plasmas
; Reflection process
; Ions
; acceleration
; deflection
; ion
; magnetic field
; prediction
; pressure effect
英文摘要: Dipolarization fronts (DFs), earthward propagating structures in the Earth's magnetotail with sharp enhancements of the northward magnetic field, can reflect and accelerate ions in the ambient plasma sheet. The ion reflection and acceleration process, which generates earthward flows ahead of the DF, also imposes a dynamic pressure on the DF to decelerate its earthward motion. It has been shown that the ion reflection process is not symmetric, with stronger ion accelerations at the evening side of the DF than at its morning side, which implies dawn-dusk asymmetric reaction of the ambient plasma and consequently dawnward deflection of DFs. In this paper, we examine this scenario in detail, by carrying out statistical studies based on Time History of Events and Macroscale Interactions during Substorms observations from 2008 to 2011. We demonstrate the important role of the ion reflection process in the longstanding problems regarding DF evolution and bursty flow braking in the near-Earth plasma sheet. Key PointsIon reflection imposes dynamic pressure on DFs to decelerate their motionAsymmetric nature of ion reflection suggests stronger evening side obstaclesThe predicted asymmetric DF braking and deflection are statistically observed ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911379070&doi=10.1002%2f2014GL061794&partnerID=40&md5=46ec928e83640009d3880658319d96be
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6939
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Space Sciences, Peking University, Beijing, China
Recommended Citation:
Zhou X.-Z.,Angelopoulos V.,Liu J.,et al. Asymmetric braking and dawnward deflection of dipolarization fronts: Effects of ion reflection[J]. Geophysical Research Letters,2014-01-01,41(20).