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Mechanism of substorm current wedge formation: THEMIS observations

文献类型：期刊论文

作者Yao, Z. H.1; Pu, Z. Y.1; Fu, S. Y.1; Angelopoulos, V.2; Kubyshkina, M.3; Xing, X.4; Lyons, L.4; Nishimura, Y.4; Xie, L.1; Wang, X. G.5
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2012-07-11
卷号39
ISSN号0094-8276
DOI10.1029/2012GL052055
文献子类Article
英文摘要This paper presents THEMIS measurements of two substorm events to show how the substorm current wedge (SCW) is generated. In the late growth phase when an earthward flow burst in the near-Earth magnetotail brakes and is diverted azimuthally, pressure gradients in the X-and Y-directions are observed to increase in the pileup and diverting regions of the flow. The enhanced pressure gradient in the Y-direction is dawnward (duskward) on the dawnside (duskside) where a clockwise (counter-clockwise) vortex forms. This dawn-dusk pressure gradient drives downward (upward) field-aligned current (FAC) on the dawnside (duskside) of the flow, which, when combined with the FACs generated by the clockwise (counter-clockwise) vortex, forms the SCW. Substorm auroral onset occurs when the vortices appear, Near-Earth dipolarization onset is observed by the THEMIS spacecraft (probes) when a rapid jump in the Y-component of pressure gradient is detected. The total FACs from the vortex and the azimuthal pressure gradient are found to be comparable to the DP-1 current in a typical substorm. Citation: Yao, Z. H., et al. (2012), Mechanism of substorm current wedge formation: THEMIS observations, Geophys. Res. Lett., 39, L13102, doi:10.1029/2012GL052055.
WOS关键词AURORAL SUBSTORMS
WOS研究方向Geology
语种英语
WOS记录号WOS:000306463800002
出版者AMER GEOPHYSICAL UNION
资助机构NSFC(40974095 ; NSFC(40974095 ; Chinese Major Research Project(2011CB811404) ; Chinese Major Research Project(2011CB811404) ; NASA(NAS5-02099) ; NASA(NAS5-02099) ; Deutsches Zentrum fur Luft-und Raumfahrt(50QP0402) ; Deutsches Zentrum fur Luft-und Raumfahrt(50QP0402) ; 41031065 ; 41031065 ; 41011120250 ; 41011120250 ; 40731056 ; 40731056 ; 40904043 ; 40904043 ; 41004072) ; 41004072) ; NSFC(40974095 ; NSFC(40974095 ; Chinese Major Research Project(2011CB811404) ; Chinese Major Research Project(2011CB811404) ; NASA(NAS5-02099) ; NASA(NAS5-02099) ; Deutsches Zentrum fur Luft-und Raumfahrt(50QP0402) ; Deutsches Zentrum fur Luft-und Raumfahrt(50QP0402) ; 41031065 ; 41031065 ; 41011120250 ; 41011120250 ; 40731056 ; 40731056 ; 40904043 ; 40904043 ; 41004072) ; 41004072) ; NSFC(40974095 ; NSFC(40974095 ; Chinese Major Research Project(2011CB811404) ; Chinese Major Research Project(2011CB811404) ; NASA(NAS5-02099) ; NASA(NAS5-02099) ; Deutsches Zentrum fur Luft-und Raumfahrt(50QP0402) ; Deutsches Zentrum fur Luft-und Raumfahrt(50QP0402) ; 41031065 ; 41031065 ; 41011120250 ; 41011120250 ; 40731056 ; 40731056 ; 40904043 ; 40904043 ; 41004072) ; 41004072) ; NSFC(40974095 ; NSFC(40974095 ; Chinese Major Research Project(2011CB811404) ; Chinese Major Research Project(2011CB811404) ; NASA(NAS5-02099) ; NASA(NAS5-02099) ; Deutsches Zentrum fur Luft-und Raumfahrt(50QP0402) ; Deutsches Zentrum fur Luft-und Raumfahrt(50QP0402) ; 41031065 ; 41031065 ; 41011120250 ; 41011120250 ; 40731056 ; 40731056 ; 40904043 ; 40904043 ; 41004072) ; 41004072)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84666]  
专题中国科学院地质与地球物理研究所
通讯作者Pu, Z. Y.
作者单位1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
2.Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90024 USA
3.St Petersburg State Univ, Inst Phys, St Petersburg, Russia
4.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA
5.Peking Univ, Sch Phys, Beijing 100871, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Yao, Z. H.,Pu, Z. Y.,Fu, S. Y.,et al. Mechanism of substorm current wedge formation: THEMIS observations[J]. GEOPHYSICAL RESEARCH LETTERS,2012,39.
APA Yao, Z. H..,Pu, Z. Y..,Fu, S. Y..,Angelopoulos, V..,Kubyshkina, M..,...&Li, J. X..(2012).Mechanism of substorm current wedge formation: THEMIS observations.GEOPHYSICAL RESEARCH LETTERS,39.
MLA Yao, Z. H.,et al."Mechanism of substorm current wedge formation: THEMIS observations".GEOPHYSICAL RESEARCH LETTERS 39(2012).

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来源：地质与地球物理研究所

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