Electron Inflow Velocities and Reconnection Rates at Earth's Magnetopause and Magnetosheath

被引：23

作者：

Burch, J. L. ^{[1
]}

Webster, J. M. ^{[2
]}

Hesse, M. ^{[3
]}

Genestreti, K. J. ^{[1
]}

Denton, R. E. ^{[4
]}

Phan, T. D. ^{[5
]}

Hasegawa, H. ^{[6
]}

Cassak, P. A. ^{[7
]}

Torbert, R. B. ^{[1
,8
]}

Giles, B. L. ^{[9
]}

Gershman, D. J. ^{[9
]}

Ergun, R. E. ^{[10
]}

Russell, C. T. ^{[11
]}

Strangeway, R. J. ^{[11
]}

Le Contel, O. ^{[12
]}

Pritchard, K. R. ^{[13
]}

Marshall, A. T. ^{[2
]}

Hwang, K. -J. ^{[1
]}

Dokgo, K. ^{[1
]}

Fuselier, S. A. ^{[1
,13
]}

Chen, L. -J. ^{[9
]}

Wang, S. ^{[14
]}

Swisdak, M. ^{[15
]}

Drake, J. F. ^{[16
]}

Argall, M. R. ^{[8
]}

Trattner, K. J. ^{[10
]}

Yamada, M. ^{[17
]}

Paschmann, G. ^{[18
]}

机构：

[1] Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USA

[2] Rice Univ, Dept Phys & Astron, Houston, TX USA

[3] Univ Bergen, Dept Phys & Technol, Bergen, Norway

[4] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA

[5] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[6] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan

[7] West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA

[8] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA

[9] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA

[10] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[11] Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO USA

[12] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA

[13] Univ Paris Sud, Univ Paris 06, CNRS, Lab Phys Plasmas,Ecole Polytech,UPMC, Paris, France

[14] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA

[15] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[16] Univ Maryland, Inst Res Elect & Appl Phys, College Pk, MD 20742 USA

[17] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ USA

[18] Max Planck Inst Extraterr Phys, Garching, Germany

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 17期

关键词：

Reconnection</AUTHOR_KEYWORD>; Magnetopause</AUTHOR_KEYWORD>; Magnetosheath</AUTHOR_KEYWORD>; DIFFUSION REGION; MAGNETIC RECONNECTION; ENERGY-CONVERSION;

D O I：

10.1029/2020GL089082

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Electron inflow and outflow velocities during magnetic reconnection at and near the dayside magnetopause are measured using satellites from NASA's Magnetospheric Multiscale (MMS) mission. A case study is examined in detail, and three other events with similar behavior are shown, with one of them being a recently published electron-only reconnection event in the magnetosheath. The measured inflow speeds of 200-400 km/s imply dimensionless reconnection rates of 0.05-0.25 when normalized to the relevant electron Alfven speed, which are within the range of expectations. The outflow speeds are about 1.5-3 times the inflow speeds, which is consistent with theoretical predictions of the aspect ratio of the inner electron diffusion region. A reconnection rate of 0.04 +/- 25% was obtained for the case study event using the reconnection electric field as compared to the 0.12 +/- 20% rate determined from the inflow velocity.

引用

页数：10

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