Kinetic Alfven wave explanation of the Hall fields in magnetic reconnection
文献类型：期刊论文
| 作者 | 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. |
| 刊名 | GEOPHYSICAL RESEARCH LETTERS
 |
| 出版日期 | 2017 |
| 卷号 | 44期号:2页码:634-640 |
| 关键词 | Kinetic Alfven Wave Hall Fields Magnetic Reconnection Hall Current |
| ISSN号 | 0094-8276 |
| 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 |
| 资助机构 | NNSFC [41574161, 41231067] ; Specialized Research Fund for State Key Laboratories of China |
| 源URL | [http://ir.nssc.ac.cn/handle/122/6129]  |
| 专题 | 国家空间科学中心_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. |
入库方式： OAI收割
来源：国家空间科学中心
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