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DOI | 10.1029/2018GL078660 |
Electron Energization at a Reconnecting Magnetosheath Current Sheet | |
Eriksson, Elin1,2; Vaivads, Andris1; Graham, Daniel B.1; Divin, Andrey1,3; Khotyaintsev, Yuri V.1; Yordanova, Emiliya1; Andre, Mats1; Giles, Barbara L.4; Pollock, Craig J.5; Russell, Christopher T.6; Le Contel, Olivier7; Torbert, Roy B.8; Ergun, Robert E.9; Lindqvist, Per-Arne10; Burch, James L.11 | |
2018-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:16页码:8081-8090 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden; Russia; USA; France |
英文摘要 | We present observations of electron energization within a sub-ion-scale magnetosheath current sheet (CS). A number of signatures indicate ongoing reconnection, including the thickness of the CS (similar to 0.7 ion inertial length), nonzero normal magnetic field, Hall magnetic fields with electrons carrying the Hall currents, and electron heating. We observe localized electron acceleration and heating parallel to the magnetic field at the edges of the CS. Electrostatic waves observed in these regions have low phase velocity and small wave potentials and thus cannot provide the observed acceleration and heating. Instead, we find that the electrons are accelerated by a parallel potential within the separatrix regions. Similar acceleration has been reported based on magnetopause and magnetotail observations. Thus, despite the different plasma conditions in magnetosheath, magnetopause, and magnetotail, the acceleration mechanism and corresponding heating of electrons is similar. Plain Language Summary Magnetic reconnection is an important physical energy conversion process in astrophysical and laboratory plasmas. The easiest place to analyze magnetic reconnection is in near-Earth space. Due to lack of sufficient electron resolution of previous spacecraft missions, there are many unanswered questions regarding electron heating and acceleration processes at small scales. In particular, the regime where thermal pressure dominates over magnetic pressure, the most common state of plasmas in the Universe, is little explored. In this letter we study such a regime using the four-spacecraft Magnetospheric Multiscale mission. We analyze a reconnecting current sheet in the magnetosheath. We show that electrons are energized by a parallel potential, similar to what has been observed in the different plasma regimes the magnetopause and magnetotail. Thus, despite different plasma conditions, a similar acceleration mechanism and corresponding heating of electrons is occurring in all these regions. |
英文关键词 | magnetic reconnection magnetosheath electron heating electron acceleration Magnetospheric Multiscale |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445612500023 |
WOS关键词 | MAGNETIC RECONNECTION ; SEARCH-COIL ; PLASMA |
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/27624 |
专题 | 气候变化 |
作者单位 | 1.Swedish Inst Space Phys, Uppsala, Sweden; 2.Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden; 3.St Petersburg State Univ, Dept Phys, St Petersburg, Russia; 4.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA; 5.Denali Sci LLC, Healy, AK USA; 6.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA; 7.Univ Paris Sud, Sorbonne Univ, Observ Paris, Ecole Polytech,CNRS,Lab Phys Plasmas, Paris, France; 8.Univ New Hampshire, Dept Phys, Durham, NH 03824 USA; 9.Univ Colorado, Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA; 10.KTH Royal Inst Technol, Dept Space & Plasma Phys, Stockholm, Sweden; 11.Southwest Res Inst, San Antonio, TX USA |
推荐引用方式 GB/T 7714 | Eriksson, Elin,Vaivads, Andris,Graham, Daniel B.,et al. Electron Energization at a Reconnecting Magnetosheath Current Sheet[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(16):8081-8090. |
APA | Eriksson, Elin.,Vaivads, Andris.,Graham, Daniel B..,Divin, Andrey.,Khotyaintsev, Yuri V..,...&Burch, James L..(2018).Electron Energization at a Reconnecting Magnetosheath Current Sheet.GEOPHYSICAL RESEARCH LETTERS,45(16),8081-8090. |
MLA | Eriksson, Elin,et al."Electron Energization at a Reconnecting Magnetosheath Current Sheet".GEOPHYSICAL RESEARCH LETTERS 45.16(2018):8081-8090. |
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