DOI: 10.1002/2014GL059290
论文题名: On the conditions preceding sudden magnetotail magnetic flux unloading
作者: Shukhtina M.A. ; Dmitrieva N.P. ; Sergeev V.A.
刊名: Geophysical Research Letters
ISSN: 0094-10359
EISSN: 1944-10090
出版年: 2014
卷: 41, 期: 4 起始页码: 1093
结束页码: 1099
语种: 英语
英文关键词: magnetotail
; solar wind/magnetosphere interactions
; substorms
Scopus关键词: Magnetic flux
; Plasma sheaths
; Growth phase
; Magnetotail magnetic flux
; Magnetotails
; Plasma sheet
; Solar wind/magnetosphere interaction
; Substorm onset
; Substorms
; Superposed-epoch analysis
; Unloading
; dissipation
; geomagnetic storm
; magnetic property
; magnetosphere
; paradigm shift
; plasma
; solar wind
英文摘要: According to the substorm paradigm, the tail magnetic flux F is accumulated during the growth phase and suddenly released afterward. However, only 33 out of 142 isolated midtail sudden unloading events identified by Geotail in 1995-1998 demonstrated monotonous F increase (type 1 substorms). In 32 cases, balanced tail flux (BTF) period (F ~constant) with enhanced dissipation and pseudobreakup activity during 0.5-2 h before unloading was registered (type 2, a new substorm class). The rest 77 substorms lie between types 1 and 2. Superposed epoch analysis revealed that during ~40 min before unloading, both groups demonstrate almost identical plasma sheet thinning and Bz decrease at Geotail. By the sudden unloading time, both groups have nearly identical Bz values in the midtail as well as at 6.6 RE. We conclude that pre-onset midtail configuration changes are common for all substorm types irrespective of flux growth. Key Points Magnetotail has different paths to substorm onset Tail flux can grow or saturate before sudden unloading onset Configuration changes irrespective of flux behavior just before onset ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84894238847&doi=10.1002%2f2014GL059290&partnerID=40&md5=72654f5512924f9adba8973fc400a47a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7623
Appears in Collections: 气候减缓与适应
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作者单位: Earth Physics Department, Saint Petersburg State University, St. Petersburg, Russian Federation
Recommended Citation:
Shukhtina M.A.,Dmitrieva N.P.,Sergeev V.A.. On the conditions preceding sudden magnetotail magnetic flux unloading[J]. Geophysical Research Letters,2014-01-01,41(4).