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题名: Kinetic Alfven wave explanation of the Hall fields in magnetic reconnection
作者: Dai, Lei; Wang, Chi; Zhang, Yongcun; Lavraud, Benoit; Burch, James; Pollock, Craig; Torbert, Roy B.
作者部门: 空间科学部
通讯作者: Dai, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
关键词: kinetic Alfven wave ; Hall fields ; magnetic reconnection ; Hall current
刊名: GEOPHYSICAL RESEARCH LETTERS
ISSN号: 0094-8276
出版日期: 2017
卷号: 44, 期号:2, 页码:634-640
收录类别: SCI
项目资助者: NNSFC [41574161, 41231067] ; Specialized Research Fund for State Key Laboratories of China
英文摘要: Magnetic reconnection is initiated in a small diffusion region but can drive global-scale dynamics in Earth's magnetosphere, solar flares, and astrophysical systems. Understanding the processes at work in the diffusion region remains a main challenge in space plasma physics. Recent in situ observations from Magnetospheric Multiscale and Time History of Events and Macroscale Interactions during Substorms reveal that the electric field normal to the reconnection current layer, often called the Hall electric field (E-n), is mainly balanced by the ion pressure gradient. Here we present theoretical explanations indicating that this observation fact is a manifestation of kinetic Alfven waves (KAWs) physics. The ion pressure gradient represents the finite gyroradius effect of KAW, leading to ion intrusion across the magnetic field lines. Electrons stream along the magnetic field lines to track ions, resulting in field-aligned currents and the associated pattern of the out-of-plane Hall magnetic field (B-m). The ratio E-n/B-m is on the order of the Alfven speed, as predicted by the KAW theory. The KAW physics further provides new perspectives on how ion intrusion may trigger electric fields suitable for reconnection to occur.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6129
Appears in Collections:空间科学部_期刊论文

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