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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.
Department空间科学部
Source PublicationGEOPHYSICAL RESEARCH LETTERS
2017
Volume44Issue:2Pages:634-640
ISSN0094-8276
Language英语
KeywordKinetic Alfven Wave Hall Fields Magnetic Reconnection Hall Current
AbstractMagnetic 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.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6129
Collection空间科学部
Corresponding AuthorDai, L (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Recommended Citation
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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