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Kinetic Alfven wave explanation of the Hall fields in magnetic reconnection
Dai, Lei; Wang, Chi; Zhang, Yongcun; Lavraud, Benoit; Burch, James; Pollock, Craig; Torbert, Roy B.; Dai, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
作者部门空间科学部
发表期刊GEOPHYSICAL RESEARCH LETTERS
2017
卷号44期号:2页码:634-640
ISSN0094-8276
语种英语
关键词Kinetic Alfven Wave Hall Fields Magnetic Reconnection Hall Current
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.
收录类别SCI
文献类型期刊论文
条目标识符http://ir.nssc.ac.cn/handle/122/6129
专题空间科学部
通讯作者Dai, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
推荐引用方式
GB/T 7714
Dai, Lei,Wang, Chi,Zhang, Yongcun,et al. Kinetic Alfven wave explanation of the Hall fields in magnetic reconnection[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(2):634-640.
APA Dai, Lei.,Wang, Chi.,Zhang, Yongcun.,Lavraud, Benoit.,Burch, James.,...&Dai, L .(2017).Kinetic Alfven wave explanation of the Hall fields in magnetic reconnection.GEOPHYSICAL RESEARCH LETTERS,44(2),634-640.
MLA Dai, Lei,et al."Kinetic Alfven wave explanation of the Hall fields in magnetic reconnection".GEOPHYSICAL RESEARCH LETTERS 44.2(2017):634-640.
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