globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA025019
Scopus ID: 2-s2.0-85043261612
MMS Observation of Asymmetric Reconnection Supported by 3-D Electron Pressure Divergence
Author: Genestreti K.J.; Varsani A.; Burch J.L.; Cassak P.A.; Torbert R.B.; Nakamura R.; Ergun R.E.; Phan T.-D.; Toledo-Redondo S.; Hesse M.; Wang S.; Giles B.L.; Russell C.T.; Vörös Z.; Hwang K.-J.; Eastwood J.P.; Lavraud B.; Escoubet C.P.; Fear R.C.; Khotyaintsev Y.; Nakamura T.K.M.; Webster J.M.; Baumjohann W.
Source Publication: Journal of Geophysical Research: Space Physics
ISSN: 21699380
Publishing Year: 2018
Volume: 123, Issue:3
pages begin: 1806
pages end: 1821
Language: 英语
Keyword: magnetic reconnection ; magnetopause reconnection ; Magnetospheric Multiscale ; turbulence
English Abstract: We identify the electron diffusion region (EDR) of a guide field dayside reconnection site encountered by the Magnetospheric Multiscale (MMS) mission and estimate the terms in generalized Ohm's law that controlled energy conversion near the X-point. MMS crossed the moderate-shear (∼130°) magnetopause southward of the exact X-point. MMS likely entered the magnetopause far from the X-point, outside the EDR, as the size of the reconnection layer was less than but comparable to the magnetosheath proton gyroradius, and also as anisotropic gyrotropic “outflow” crescent electron distributions were observed. MMS then approached the X-point, where all four spacecraft simultaneously observed signatures of the EDR, for example, an intense out-of-plane electron current, moderate electron agyrotropy, intense electron anisotropy, nonideal electric fields, and nonideal energy conversion. We find that the electric field associated with the nonideal energy conversion is (a) well described by the sum of the electron inertial and pressure divergence terms in generalized Ohms law though (b) the pressure divergence term dominates the inertial term by roughly a factor of 5:1, (c) both the gyrotropic and agyrotropic pressure forces contribute to energy conversion at the X-point, and (d) both out-of-the-reconnection-plane gradients (∂/∂M) and in-plane (∂/∂L,N) in the pressure tensor contribute to energy conversion near the X-point. This indicates that this EDR had some electron-scale structure in the out-of-plane direction during the time when (and at the location where) the reconnection site was observed. ©2018. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:19   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:气候减缓与适应

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Affiliation: Space Research Institute, Austrian Academy of Sciences, Graz, Austria; Southwest Research Institute, San Antonio, TX, United States; Department of Physics and Astronomy, West Virginia University, Morgantown, WV, United States; Space Science Center, University of New Hampshire, Durham, NH, United States; Department of Astrophysical and Planetary Sciences, University of Colorado Boulder, Boulder, CO, United States; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Space Science Institute, University of California Berkeley, Berkeley, CA, United States; Science Directorate, European Space Agency, ESAC, Madrid, Spain; Birkeland Centre for Space Science, University of Bergen, Bergen, Norway; Astronomy Department, University of Maryland, College Park, MD, United States; Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA, United States; The Blackett Laboratory, Imperial College London, London, United Kingdom; Institute de Recherche en Astrophysique et Planétologie, Toulouse, France; Space Science Department, European Space Agency, Noordwijk, Netherlands; Department of Physics & Astronomy, University of Southampton, Southampton, United Kingdom; Swedish Institute of Space Physics, Uppsala, Sweden; Department of Physics and Astronomy, Rice University, Houston, TX, United States

Recommended Citation:
Genestreti K.J.,Varsani A.,Burch J.L.,et al. MMS Observation of Asymmetric Reconnection Supported by 3-D Electron Pressure Divergence[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)
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