globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024524
Scopus ID: 2-s2.0-85042288927
Electron Dynamics Within the Electron Diffusion Region of Asymmetric Reconnection
Author: Argall M.R.; Paulson K.; Alm L.; Rager A.; Dorelli J.; Shuster J.; Wang S.; Torbert R.B.; Vaith H.; Dors I.; Chutter M.; Farrugia C.; Burch J.; Pollock C.; Giles B.; Gershman D.; Lavraud B.; Russell C.T.; Strangeway R.; Magnes W.; Lindqvist P.-A.; Khotyaintsev Y.V.; Ergun R.E.; Ahmadi N.
Source Publication: Journal of Geophysical Research: Space Physics
ISSN: 21699380
Publishing Year: 2018
Volume: 123, Issue:1
pages begin: 146
pages end: 162
Language: 英语
Keyword: Agyrotropy ; Crescent Distribution ; EDI ; EDR ; Magnetic Reconnection ; MMS
English Abstract: We investigate the agyrotropic nature of electron distribution functions and their substructure to illuminate electron dynamics in a previously reported electron diffusion region (EDR) event. In particular, agyrotropy is examined as a function of energy to reveal detailed finite Larmor radius effects for the first time. It is shown that the previously reported ∼66 eV agyrotropic “crescent” population that has been accelerated as a result of reconnection is evanescent in nature because it mixes with a denser, gyrotopic background. Meanwhile, accelerated agyrotropic populations at 250 and 500 eV are more prominent because the background plasma at those energies is more tenuous. Agyrotropy at 250 and 500 eV is also more persistent than at 66 eV because of finite Larmor radius effects; agyrotropy is observed 2.5 ion inertial lengths from the EDR at 500 eV, but only in close proximity to the EDR at 66 eV. We also observe linearly polarized electrostatic waves leading up to and within the EDR. They have wave normal angles near 90°, and their occurrence and intensity correlate with agyrotropy. Within the EDR, they modulate the flux of 500 eV electrons travelling along the current layer. The net electric field intensifies the reconnection current, resulting in a flow of energy from the fields into the plasma. ©2017. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:7   [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 Science Center, University of New Hampshire, Durham, NH, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Southwest Research Institute, San Antonio, TX, United States; Institut de Recherche en Astrophysique et Planétologie, CNRS, UPS, Université de Toulouse, France; Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, United States; Space Research Institute, Austrian Academy of Sciences, Graz, Austria; KTH Royal Institute of Technology, Stockholm, Sweden; Swedish Institute of Space Physics, Uppsala, Sweden; University of Colorado Boulder, Boulder, CO, United States

Recommended Citation:
Argall M.R.,Paulson K.,Alm L.,et al. Electron Dynamics Within the Electron Diffusion Region of Asymmetric Reconnection[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)
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