DOI: 10.1002/2014GL059309
论文题名: Stopping flow bursts and their role in the generation of the substorm current wedge
作者: Sergeev V.A. ; Chernyaev I.A. ; Angelopoulos V. ; Runov A.V. ; Nakamura R.
刊名: Geophysical Research Letters
ISSN: 0094-10355
EISSN: 1944-10086
出版年: 2014
卷: 41, 期: 4 起始页码: 1106
结束页码: 1112
语种: 英语
英文关键词: dipolarization
; flow burst
; magnetotail
; substorm current wedge
Scopus关键词: Magnetosphere
; Compression regions
; Dipolarization
; Entropy changes
; Entropy distribution
; flow burst
; Inner magnetosphere
; Magnetotails
; Substorms
; Entropy
; entropy
; magnetosphere
; observational method
; plasma
; polarization
; storm
; timescale
英文摘要: During two flow burst events, earthward propagating dipolarization/ injection fronts (DF) fortuitously stopped at ~9Re within a unique, compact multispacecraft constellation for the duration of a 30 min long substorm current wedge-related dipolarization. Observations inside and outside the halted flow burst indicate that it retained properties (including a narrow DF, a localized compression region ahead of it, and its structured, low density, low entropy (pV5/3) content) when arrived at its stopping point, where the entropy of the ambient plasma was nearly equal to that of the flow burst. We show that even short-duration flow bursts can significantly modify pressure and entropy distributions in the inner magnetosphere. The new distribution takes a long time to relax (a few tens of minutes, consistent with substorm recovery time scales). We argue that these pressure and entropy changes resulting from the incoming flow bursts can be responsible for the support/generation of a substorm current wedge. Key Points Flow burst stops where its entropy is nearly equal to entropy of ambient plasma Flow burst modifies pressure and entropy distribution in the inner magnetosphere Long relaxation time after the FB subsided provides long-duration SCW effects ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84894262236&doi=10.1002%2f2014GL059309&partnerID=40&md5=e386499891c34135d73c46435503fa38
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7619
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth's Physics, St. Petersburg State University, St. Petersburg, Russian Federation
Recommended Citation:
Sergeev V.A.,Chernyaev I.A.,Angelopoulos V.,et al. Stopping flow bursts and their role in the generation of the substorm current wedge[J]. Geophysical Research Letters,2014-01-01,41(4).