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题名: Quantitative analysis of a Hall system in the exhaust of asymmetric magnetic reconnection
作者: Zhang, Y. C.; Lavraud, B.; Dai, L.; Wang, C.; Marchaudon, A.; Avanov, L.; Burch, J.; Chandler, M.; Dorelli, J.; Duan, S. P.; Ergun, R. E.; Gershman, D. J.; Giles, B.; Khotyaintsev, Y. V.; Lindqvist, P. A.; Paterson, W.; Russell, C. T.; Schiff, C.; Tang, B. B.; Torbert, R.
作者部门: 空间科学部
通讯作者: Zhang, YC (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China. ; Zhang, YC (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China. ; Zhang, YC (reprint author), Univ Toulouse UPS, Inst Rech & Astrophys & Planotol, Toulouse, France. ; Zhang, YC (reprint author), Ctr Natl Rech Sci, Toulouse, France.
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN号: 2169-9380
出版日期: 2017
卷号: 122, 期号:5, 页码:5277-5289
收录类别: SCI
项目资助者: National Natural Science Foundation of China [41574163, 41574159, 41574161, 41231066] ; Specialized Research Fund for State Key Laboratories ; CNRS ; CNES
英文摘要: Taking advantage of high-resolution measurements from the MMS mission, we find evidence for a complete Hall system in the exhaust of asymmetric magnetic reconnection 40D(i) downstream of the X line. The investigation of the fine structure of the Hall system reveals that it displays features in the exhaust similar to those reported previously in the ion diffusion region by simulations and observations. This finding confirms the importance of particle-scale processes in the reconnection exhaust as well. On the magnetospheric side of the exhaust, electrons are strongly accelerated by parallel electric fields. This process significantly contributes to feed the Hall current system, resulting in a nonnegligible Hall magnetic field signature on this side despite an otherwise lower density. Calculation of the induced out-of-plane magnetic field by in-plane currents (based on Biot-Savart law) provides direct quantitative evidence for the process of Hall magnetic field generation by the Hall current system. A strong normal Hall electric field is present only on the magnetospheric side of the exhaust region, consistent with previous works. Multipoint data analysis shows that the ion pressure gradient in the ion momentum equation produces this Hall electric field. This global pattern of the Hall system can be explained by kinetic Alfven wave theory.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5987
Appears in Collections:空间科学部_期刊论文

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