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DOI | 10.1002/2016GL072011 |
Electron currents supporting the near-Earth magnetotail during current sheet thinning | |
Artemyev, A. V.1,2,3; Angelopoulos, V.1,2; Liu, J.1,2; Runov, A.1,2 | |
2017 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:1页码:43596 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Russia |
英文摘要 | Formation of intense, thin current sheets (i.e., current sheet thinning) is a critical process for magnetospheric substorms, but the kinetic physics of this process remains poorly understood. Using a triangular configuration of the three Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft at the end of 2015 we investigate field-aligned and transverse currents in the magnetotail current sheet around 12 Earth radii downtail. Combining the curlometer technique with direct measurements of ion and electron velocities, we demonstrate that intense, thin current sheets supported by strong electron currents form in this region. Electron field-aligned currents maximize near the neutral plane B-x approximate to 0, attaining magnitudes of approximate to 20nA/m(2). Carried by hot (>1keV) electrons, they generate strong magnetic shear, which contributes up to 20% of the vertical (along the normal direction to the equatorial plane) pressure balance. Electron transverse currents, on the other hand, are carried by the curvature drift of anisotropic, colder (<1keV) electrons and gradually increase during the current sheet thinning. In the events under consideration the thinning process was abruptly terminated by earthward reconnection fronts which have been previously associated with tail reconnection further downtail. It is likely that the thin current sheet properties described herein are similar to conditions further downtail and are linked to the loss of stability and onset of reconnection there. Our findings are likely applicable to thin current sheets in other geophysical and astrophysical settings. |
英文关键词 | magnetotail substorm current sheet |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000393954900001 |
WOS关键词 | SUBSTORM GROWTH-PHASE ; JOVIAN MAGNETOTAIL ; GEOMAGNETIC TAIL |
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/27907 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA; 2.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA; 3.RAS, Space Res Inst, Moscow, Russia |
推荐引用方式 GB/T 7714 | Artemyev, A. V.,Angelopoulos, V.,Liu, J.,et al. Electron currents supporting the near-Earth magnetotail during current sheet thinning[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(1):43596. |
APA | Artemyev, A. V.,Angelopoulos, V.,Liu, J.,&Runov, A..(2017).Electron currents supporting the near-Earth magnetotail during current sheet thinning.GEOPHYSICAL RESEARCH LETTERS,44(1),43596. |
MLA | Artemyev, A. V.,et al."Electron currents supporting the near-Earth magnetotail during current sheet thinning".GEOPHYSICAL RESEARCH LETTERS 44.1(2017):43596. |
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