DOI: 10.1002/2015GL064806
论文题名: On the correlation between the fast solar wind flow changes and substorm occurrence
作者: Semenov V.S. ; Kubyshkina D.I. ; Kubyshkina M.V. ; Kubyshkin I.V. ; Partamies N.
刊名: Geophysical Research Letters
ISSN: 0094-9476
EISSN: 1944-9207
出版年: 2015
卷: 42, 期: 13 起始页码: 5117
结束页码: 5124
语种: 英语
英文关键词: asymmetry
; current sheet
; magnetosphere
; substorms
Scopus关键词: Electric fields
; Magnetosphere
; Probability distributions
; Vlasov equation
; asymmetry
; Current sheets
; Equation solution
; Fast solar winds
; Induced electric fields
; Magnetospheric substorms
; Substorms
; Wind directions
; Solar wind
; asymmetry
; correlation
; database
; electric field
; magnetosphere
; magnetotail
; solar wind
; tilt
; wind direction
; wind measurement
英文摘要: There is a point of view that solar wind factors, which break the magnetotail symmetry, are more effective in triggering the magnetospheric substorm. To clarify the question we use a database of substorm onsets and found the evident dependence of the substorm probability on the solar wind flow direction jumps (asymmetric factor), while distribution of the substorm occurrence on the solar wind number density jumps (symmetric factor) is homogeneous. The theoretical interpretation is based on the extension of the existing symmetric Kan model for a bent current sheet. Allowing the model tilt angle to vary in time, we found that the induced electric field penetrates to the central region of the bent current sheet. If the solar wind direction jump increases the bending, then induced electric field thins the current sheet and thus stimulates the reconnection. In the opposite case the current sheet thickens. We claim that this effect is sufficient (provides twice or more thinning of the current sheet in 10min). Key Points Breaking the magnetotail symmetry increases possibility of substorm triggering Extension of the existing Vlasov equation solutions for the bent current sheet Possible reason of substorm occurrence coupling with solar wind direction jumps. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938125252&doi=10.1002%2f2015GL064806&partnerID=40&md5=4c09017bae8dbea190173038e2d73ddb
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9091
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Earth Physics Department, Saint Petersburg State University, Saint Petersburg, Russian Federation
Recommended Citation:
Semenov V.S.,Kubyshkina D.I.,Kubyshkina M.V.,et al. On the correlation between the fast solar wind flow changes and substorm occurrence[J]. Geophysical Research Letters,2015-01-01,42(13).