Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection

doi:10.1029/2011JA017384

	Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection
	Wang, Rongsheng 1; Nakamura, Rumi 1; Lu, Quanming 2; Du, Aimin 3; Zhang, Tielong 1; Baumjohann, Wolfgang 1; Khotyaintsev, Yuri V.4; Volwerk, Martin 1; Andre, Mats 4; Fujimoto, M.5
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2012-07-31
卷号	117
ISSN号	2169-9380
DOI	10.1029/2011JA017384
文献子类	Article
英文摘要	A magnetic reconnection event with a moderate guide field encountered by Cluster in the near-Earth tail on 28 August 2002 is reported. The guide field points dawnward during this event. The quadrupolar structure of the Hall magnetic field within the ion diffusion region is distorted toward the northern hemisphere in the earthward part while toward the southern hemisphere tailward part of X-line. Observations of current density and electron pitch angle distribution indicate that the distorted quadrupolar structure is formed due to a deformed Hall electron current system. Cluster crossed the ion diffusion region from south to north earthward of the X-line. An electron density cavity is confirmed in the northern separatrix layer while a thin current layer (TCL) is measured in the southern separatrix layer. The TCL is formed due to electrons injected into the X-line along the magnetic field. These observations are different from simulation results where the cavity is produced associated with inflow electrons along the southern separatrix while the strong current sheet appears with the outflow electron beam along the northern separatrix. The energy of the inflowing electron in the separatrix layer could extend up to 10 keV. Energetic electron fluxes up to 50 keV have a clear peak in the TCL. The length of the separatrix layer is estimated to be at least 65 c/omega(pi). These observations suggest that electrons could be pre-accelerated before they are ejected into the X-line region along the separatrix. Multiple secondary flux ropes moving earthward are observed within the diffusion region. These secondary flux ropes are all identified earthward of the observed TCL. These observations further suggest there are numerous small scale structures within the ion diffusion region.
WOS关键词	EARTHS MAGNETOTAIL ; DIFFUSION REGION ; COLLISIONLESS RECONNECTION ; ELECTRON ACCELERATION ; CLUSTER ; BOUNDARY ; MAGNETOPAUSE ; SIMULATIONS ; ANTIPARALLEL ; GENERATION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000307181100002
资助机构	Austrian Science Fund (FWF)(I429-N16) ; Austrian Science Fund (FWF)(I429-N16) ; National Science Foundation of China (NSFC)(41174122 ; National Science Foundation of China (NSFC)(41174122 ; China Postdoctoral Science Foundation(2011M500030) ; China Postdoctoral Science Foundation(2011M500030) ; 41104092) ; 41104092) ; Austrian Science Fund (FWF)(I429-N16) ; Austrian Science Fund (FWF)(I429-N16) ; National Science Foundation of China (NSFC)(41174122 ; National Science Foundation of China (NSFC)(41174122 ; China Postdoctoral Science Foundation(2011M500030) ; China Postdoctoral Science Foundation(2011M500030) ; 41104092) ; 41104092) ; Austrian Science Fund (FWF)(I429-N16) ; Austrian Science Fund (FWF)(I429-N16) ; National Science Foundation of China (NSFC)(41174122 ; National Science Foundation of China (NSFC)(41174122 ; China Postdoctoral Science Foundation(2011M500030) ; China Postdoctoral Science Foundation(2011M500030) ; 41104092) ; 41104092) ; Austrian Science Fund (FWF)(I429-N16) ; Austrian Science Fund (FWF)(I429-N16) ; National Science Foundation of China (NSFC)(41174122 ; National Science Foundation of China (NSFC)(41174122 ; China Postdoctoral Science Foundation(2011M500030) ; China Postdoctoral Science Foundation(2011M500030) ; 41104092) ; 41104092)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84668]
专题	中国科学院地质与地球物理研究所
通讯作者	Wang, Rongsheng
作者单位	1.Austrian Acad Sci, Space Res Inst, AT-8042 Graz, Austria 2.Univ Sci & Technol China, Dept Geophys & Planetary Sci, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 4.Swedish Inst Space Phys, Uppsala, Sweden 5.JAXA, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan 6.Mullard Space Sci Lab, Surrey, England 7.Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing, Peoples R China 8.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA
推荐引用方式 GB/T 7714	Wang, Rongsheng,Nakamura, Rumi,Lu, Quanming,et al. Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117.
APA	Wang, Rongsheng.,Nakamura, Rumi.,Lu, Quanming.,Du, Aimin.,Zhang, Tielong.,...&Lu, San.(2012).Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117.
MLA	Wang, Rongsheng,et al."Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012).