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
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出版日期 | 2012-07-11 |
卷号 | 39 |
ISSN号 | 0094-8276 |
DOI | 10.1029/2012GL052055 |
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). |
入库方式: OAI收割
来源:地质与地球物理研究所
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