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DOI | 10.1029/2018GL080944 |
Observational Evidence of Magnetic Reconnection in the Terrestrial Bow Shock Transition Region | |
Wang, Shan1,2; Chen, Li-Jen2; Bessho, Naoki1,2; Hesse, Michael3,4; Wilson, Lynn B., III2; Giles, Barbara2; Moore, Thomas E.2; Russell, Christopher T.5; Torbert, Roy B.6; Burch, James L.4 | |
2019-01-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:2页码:562-570 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Norway |
英文摘要 | We report evidence of magnetic reconnection in the transition region of the Earth's bow shock when the angle between the shock normal and the immediate upstream magnetic field is 65 degrees. An ion-skin-depth-scale current sheet exhibits the Hall current and field pattern, electron outflow jet, and enhanced energy conversion rate through the nonideal electric field, all consistent with a reconnection diffusion region close to the X-line. In the diffusion region, electrons are modulated by electromagnetic waves. An ion exhaust with energized field-aligned ions and electron parallel heating are observed in the same shock transition region. The energized ions are more separated from the inflowing ions in velocity above the current sheet than below, possibly due to the shear flow between the two inflow regions. The observation suggests that magnetic reconnection may contribute to shock energy dissipation. Plain Language Summary Collisionless shock and magnetic reconnection are two fundamental plasma processes where significant energy conversion between electromagnetic fields and particles occurs. Knowledge is still lacking for whether reconnection occurs at the shock transition region and whether the reconnection property at the shock is different from that which occurs elsewhere. In this letter, we report the existence of reconnection at the Earth's bow shock. Many features are consistent with those in standard reconnection, such as the electron flow and field structures in the diffusion region, and the feature of ion and electron heating in the exhaust. The results suggest reconnection to be one energy dissipation mechanism at the shock, which encourages further investigation. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000458607400005 |
WOS关键词 | EARTHS MAGNETOPAUSE DEPENDENCE ; INFLOW ALFVEN SPEED ; ELECTRIC-FIELD ; DYNAMICS ; VICINITY ; SHEAR ; MMS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26730 |
专题 | 气候变化 |
作者单位 | 1.Univ Maryland, Astron Dept, College Pk, MD 20742 USA; 2.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; 3.Univ Bergen, Dept Phys & Technol, Bergen, Norway; 4.Southwest Res Inst, San Antonio, TX USA; 5.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA; 6.Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA |
推荐引用方式 GB/T 7714 | Wang, Shan,Chen, Li-Jen,Bessho, Naoki,et al. Observational Evidence of Magnetic Reconnection in the Terrestrial Bow Shock Transition Region[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(2):562-570. |
APA | Wang, Shan.,Chen, Li-Jen.,Bessho, Naoki.,Hesse, Michael.,Wilson, Lynn B., III.,...&Burch, James L..(2019).Observational Evidence of Magnetic Reconnection in the Terrestrial Bow Shock Transition Region.GEOPHYSICAL RESEARCH LETTERS,46(2),562-570. |
MLA | Wang, Shan,et al."Observational Evidence of Magnetic Reconnection in the Terrestrial Bow Shock Transition Region".GEOPHYSICAL RESEARCH LETTERS 46.2(2019):562-570. |
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