DOI: 10.1029/2012GL054528
论文题名: The dependence of magnetic reconnection on plasma β and magnetic shear: Evidence from magnetopause observations
作者: Phan T.D. ; Paschmann G. ; Gosling J.T. ; Oieroset M. ; Fujimoto M. ; Drake J.F. ; Angelopoulos V.
刊名: Geophysical Research Letters
ISSN: 0094-9416
EISSN: 1944-9147
出版年: 2013
卷: 40, 期: 1 起始页码: 11
结束页码: 16
语种: 英语
Scopus关键词: Current sheets
; High shear
; Laboratory plasma
; Magnetic reconnections
; Magnetic shear
; Shear conditions
; Statistical study
; Subsolar region
; Magnetopause
; Magnetoplasma
; asymmetric information
; atmospheric electricity
; magnetopause
; plasma
; pressure gradient
; spacecraft
英文摘要: We have performed a statistical study of THEMIS spacecraft crossings of the asymmetric dayside magnetopause to test the prediction that the diamagnetic drift of the X-line due to a plasma pressure gradient across the magnetopause can suppress magnetic reconnection. The study includes crossings both when reconnection exhausts were present and when they were absent in the current sheet. When we restrict the survey to the subsolar region (10 < MLT < 14), we find that for low Δβ (the difference of plasma β on the two sides of the current sheet) the majority of reconnection events occurred over a large range of magnetic shears, whereas when Δβ was high reconnection events occurred only for high shears. Furthermore, nonreconnection events occurred primarily in the Δβ-shear regime in which reconnection is predicted to be suppressed, in good agreement with theory. The Δβ-shear condition should have general consequences for the occurrence of reconnection in space and laboratory plasmas. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84874854101&doi=10.1029%2f2012GL054528&partnerID=40&md5=5b49d492d8ca981f0f9fc1bf8cbb44a5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6680
Appears in Collections: 气候减缓与适应
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作者单位: University of California, Berkeley, CA, United States
Recommended Citation:
Phan T.D.,Paschmann G.,Gosling J.T.,et al. The dependence of magnetic reconnection on plasma β and magnetic shear: Evidence from magnetopause observations[J]. Geophysical Research Letters,2013-01-01,40(1).