Development and validation of inversion technique for substorm current wedge using ground magnetic field data

doi:10.1002/2013JA019185

	Development and validation of inversion technique for substorm current wedge using ground magnetic field data
	Chu, Xiangning 1,2; Hsu, Tung-Shin 1,2; McPherron, Robert L.1,2; Angelopoulos, Vassilis 1,2; Pu, Zuyin 3; Weygand, James J.1,2; Khurana, Krishan 1,2; Connors, Martin 4; Kissinger, Jennifer 5; Zhang, Hui 6
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2014-03-01
卷号	119 期号:3 页码:1909-1924
ISSN号	2169-9380
DOI	10.1002/2013JA019185
文献子类	Article
英文摘要	The classic substorm current wedge model represents ground and space magnetic perturbations measured during substorms. We have developed an inversion technique to calculate parameters determining the intensity and geometry of the current system using magnetic field data at midlatitudes. The current wedge consists of four segments: a sheet-like field-aligned current downward to the ionosphere postmidnight, a westward current across the auroral bulge, an upward sheet-like current from the westward surge premidnight, and an eastward current in the equatorial plane. The model has five parameters including the current strength, the locations, and breadths of the two field-aligned current sheets. Simultaneous changes in the ring current are represented by the superposition of a symmetric ring current and a partial ring current characterized by three additional parameters. Parameters of the model are determined as a function of time based on midlatitude ground magnetometers, using realistic field lines and accounting for Earth's induction. The model is validated by a variety of techniques. First, the model predicts more than 80% of the variance in the observations. Second, the intensity of the current wedge and the ring current follows the same trends of the westward electrojet and the ring current indices. Third, the intensity of the westward electrojet agrees extremely well with the intensity of the current wedge. Finally, spacecraft observations of the aurora correspond with the evolution deduced from the model. This model of the substorm current wedge provides a valuable tool for the study of substorm development and its relation to phenomena in space.
WOS关键词	ELEMENTARY CURRENT SYSTEMS ; MAGNETOSPHERIC SUBSTORMS ; CURRENT DISRUPTION ; IMAGE-FUV ; POLAR ELECTROJETS ; TAIL RECONNECTION ; ALIGNED CURRENT ; CURRENT MODEL ; ONSET ; MAGNETOTAIL
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000336218300041
资助机构	NASA(NNX10AE61G) ; NASA(NNX10AE61G) ; NSF(AGS-1003854) ; NSF(AGS-1003854) ; NASA(NNX10AE61G) ; NASA(NNX10AE61G) ; NSF(AGS-1003854) ; NSF(AGS-1003854) ; NASA(NNX10AE61G) ; NASA(NNX10AE61G) ; NSF(AGS-1003854) ; NSF(AGS-1003854) ; NASA(NNX10AE61G) ; NASA(NNX10AE61G) ; NSF(AGS-1003854) ; NSF(AGS-1003854)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85593]
专题	中国科学院地质与地球物理研究所
通讯作者	Chu, Xiangning
作者单位	1.Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90024 USA 2.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA 3.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China 4.Athabasca Univ, Geophys Observ, Athabasca, AB, Canada 5.NASA, Goddard Space Flight Ctr, College Pk, MD USA 6.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 7.Finnish Meteorol Inst, FIN-00101 Helsinki, Finland
推荐引用方式 GB/T 7714	Chu, Xiangning,Hsu, Tung-Shin,McPherron, Robert L.,et al. Development and validation of inversion technique for substorm current wedge using ground magnetic field data[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2014,119(3):1909-1924.
APA	Chu, Xiangning.,Hsu, Tung-Shin.,McPherron, Robert L..,Angelopoulos, Vassilis.,Pu, Zuyin.,...&Amm, Olaf.(2014).Development and validation of inversion technique for substorm current wedge using ground magnetic field data.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,119(3),1909-1924.
MLA	Chu, Xiangning,et al."Development and validation of inversion technique for substorm current wedge using ground magnetic field data".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 119.3(2014):1909-1924.