期刊
ASTROPHYSICAL JOURNAL
卷 805, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/805/1/43
关键词
magnetic reconnection; plasmas; solar wind; Sun: heliosphere
资金
- NASA [NNX08AO84G, NNX08AO83G]
- NSF [ATM-1102527]
- European Union's Seventh Programme for Research, Technological Development, and Demonstration [284461]
- Science and Technology Facilities Council [ST/L001276/1, ST/I000623/1, ST/M003116/1, ST/K001051/1, ST/G008272/1, ST/H002383/1, ST/H00419X/1] Funding Source: researchfish
- UK Space Agency [ST/J004553/1, ST/N002784/1] Funding Source: researchfish
- STFC [ST/H002383/1, ST/G008272/1, ST/K001051/1, ST/H00419X/1, ST/I000623/1] Funding Source: UKRI
We report new multi-spacecraft Cluster observations of tripolar guide magnetic field perturbations at a solar wind reconnection exhaust in the presence of a guide field B-M. which is almost four times as strong as the reversing field B-L. The novel tripolar field consists of two narrow regions of depressed B-M, with an observed 7%-14% Delta B-M magnitude relative to the external field, which are found adjacent to a wide region of enhanced BM within the exhaust. A stronger reversing field is associated with each B-M depression. A kinetic reconnection simulation for realistic solar wind conditions and the observed strong guide field reveals that tripolar magnetic fields preferentially form across current sheets in the presence of multiple X-lines as magnetic islands approach one another and merge into fewer and larger islands. The simulated Delta B-M/Delta X-N over the normal width Delta X-N between a B-M minimum and the edge of the external region agree with the normalized values observed by Cluster. We propose that a tripolar guide field perturbation may be used to identify candidate regions containing multiple X-lines and interacting magnetic islands at individual solar wind current sheets with a strong guide field.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据