NSSC OpenIR  > 空间科学部
Kinetic Alfvén wave explanation of the Hall fields in magnetic reconnection
Lei Dai; Chi Wang; Yongcun Zhang; Benoit Lavraud; James Burch; Craig Pollock; Roy B. Torbert
Source PublicationGeophysical Research Letters
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 (En), is mainly balanced by the ion pressure gradient. Here we present theoretical explanations indicating that this observation fact is a manifestation of kinetic Alfvén 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 (Bm). The ratio ΔEnBm is on the order of the Alfvén 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 ; EI
Document Type期刊论文
Recommended Citation
GB/T 7714
Lei Dai,Chi Wang,Yongcun Zhang,et al. Kinetic Alfvén wave explanation of the Hall fields in magnetic reconnection[J]. Geophysical Research Letters,2017,44(2):634–640.
APA Lei Dai.,Chi Wang.,Yongcun Zhang.,Benoit Lavraud.,James Burch.,...&Roy B. Torbert.(2017).Kinetic Alfvén wave explanation of the Hall fields in magnetic reconnection.Geophysical Research Letters,44(2),634–640.
MLA Lei Dai,et al."Kinetic Alfvén wave explanation of the Hall fields in magnetic reconnection".Geophysical Research Letters 44.2(2017):634–640.
Files in This Item: Download All
File Name/Size DocType Version Access License
2017grl55329.pdf(398KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Lei Dai]'s Articles
[Chi Wang]'s Articles
[Yongcun Zhang]'s Articles
Baidu academic
Similar articles in Baidu academic
[Lei Dai]'s Articles
[Chi Wang]'s Articles
[Yongcun Zhang]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Lei Dai]'s Articles
[Chi Wang]'s Articles
[Yongcun Zhang]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2017grl55329.pdf
Format: Adobe PDF
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.