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DOI | 10.1029/2019GL084636 |
Energy Conversion and Electron Acceleration in the Magnetopause Reconnection Diffusion Region | |
Pritchard, K. R.1,2; Burch, J. L.2; Fuselier, S. A.1,2; Webster, J. M.3; Torbert, R. B.2,4; Argall, M. R.4; Broll, J.5; Genestreti, K. J.4; Giles, B. L.6; Le Contel, O.7; Mukherjee, J.2; Phan, T. D.8; Rager, A. C.9; Russell, C. T.10; Strangeway, R. J.11 | |
2019-09-10 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | USA; France |
英文摘要 | Data are analyzed from a Magnetospheric Multiscale encounter with a dayside magnetopause reconnection region on 29 December 2016. The uniqueness of the event stems from the small (similar to 7 km) average spacecraft separation and the sequential sampling of an electron diffusion region with electron crescent distributions. We quantitatively investigate the earthward acceleration of magnetosheath electrons through the in-plane null by the polarization electric field E-N that points radially outward from the magnetopause. The results compare favorably with previous plasma simulations with one important difference that the reconnection electric field (E-M) extends throughout the region of strong E-N so that both fields energize electrons in the same region. This acceleration is quantified here for the first time. As the spacecraft penetrate deeper into the region of enhanced E-N, the magnetic reflection of lower-energy electrons produces a thinner crescent. Plain Language Summary Reconnection causes the conversion of magnetic energy to particle energy and the breaking and reconnection of solar wind and geomagnetic field lines. In asymmetric reconnection at the dayside magnetopause with different plasma densities and magnetic field strengths on the Earth and Sun sides of an X-line, this energy conversion is displaced to the earthward side of the current layer. An electric field pointing outward normal to the dayside magnetopause drives reconnection by accelerating solar wind electrons across the reconnection current sheet. These electrons take up dawnward-directed meandering orbits, and they are ultimately the carriers of the reconnection current. This paper reports the first direct measurement of this acceleration. |
英文关键词 | magnetic reconnection electron diffusion region magnetosheath magnetosphere magnetopause |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000485396400001 |
WOS关键词 | MAGNETIC RECONNECTION |
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/186978 |
专题 | 气候变化 |
作者单位 | 1.Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA; 2.Southwest Res Inst, Dept Space Sci & Engn, San Antonio, TX 78238 USA; 3.Rice Univ, Dept Phys & Astron, Houston, TX USA; 4.Univ New Hampshire, Dept Phys & Astron, Durham, NH 03824 USA; 5.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 6.NASA, Goddard Space Flight Ctr, Dept Heliophys, Greenbelt, MD USA; 7.Univ Paris Sud, Sorbonne Univ, Ecole Polytech, CNRS,Lab Phys Plasmas,Observ Paris, Paris, France; 8.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA; 9.Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA; 10.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA USA; 11.Univ Calif Los Angeles, IGPP ESS, Dept Phys & Astron, Los Angeles, CA USA |
推荐引用方式 GB/T 7714 | Pritchard, K. R.,Burch, J. L.,Fuselier, S. A.,et al. Energy Conversion and Electron Acceleration in the Magnetopause Reconnection Diffusion Region[J]. GEOPHYSICAL RESEARCH LETTERS,2019. |
APA | Pritchard, K. R..,Burch, J. L..,Fuselier, S. A..,Webster, J. M..,Torbert, R. B..,...&Strangeway, R. J..(2019).Energy Conversion and Electron Acceleration in the Magnetopause Reconnection Diffusion Region.GEOPHYSICAL RESEARCH LETTERS. |
MLA | Pritchard, K. R.,et al."Energy Conversion and Electron Acceleration in the Magnetopause Reconnection Diffusion Region".GEOPHYSICAL RESEARCH LETTERS (2019). |
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