DOI: 10.1002/2016GL070763
论文题名: A new model for the electron pressure nongyrotropy in the outer electron diffusion region
作者: Divin A. ; Semenov V. ; Korovinskiy D. ; Markidis S. ; Deca J. ; Olshevsky V. ; Lapenta G.
刊名: Geophysical Research Letters
ISSN: 0094-8460
EISSN: 1944-8191
出版年: 2016
卷: 43, 期: 20 起始页码: 10565
结束页码: 10573
语种: 英语
英文关键词: electron diffusion
; nongyrotropy
; reconnection
Scopus关键词: Anisotropy
; Diffusion
; Magnetosphere
; Analytical estimates
; Electron diffusion
; Electron pressure tensor
; Magnetic reconnections
; Magnetospheric multiscale missions
; Nongyrotropy
; Particle-in-cell simulations
; Reconnection
; Electrons
英文摘要: We present a new model to describe the electron pressure nongyrotropy inside the electron diffusion region (EDR) in an antiparallel magnetic reconnection scenario. A combination of particle-in-cell simulations and analytical estimates is used to identify such a component of the electron pressure tensor in the rotated coordinates, which is nearly invariant along the outflow direction between the X line and the electron remagnetization points in the outer EDR. It is shown that the EDR two-scale structure (inner and outer parts) is formed due to superposition of the nongyrotropic meandering electron population and gyrotropic electron population with large anisotropy parallel to the magnetic field upstream of the EDR. Inside the inner EDR the influence of the pressure anisotropy can largely be ignored. In the outer EDR, a thin electron layer with electron flow speed exceeding the E × B drift velocity is supported by large-momentum flux produced by the electron pressure anisotropy upstream of the EDR. We find that this fast electron exhaust flow with |Ve×B|>|E| is in fact a constituent part of the EDR, a finding which will steer the interpretation of the Magnetospheric Multiscale Mission (MMS) data. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84992346118&doi=10.1002%2f2016GL070763&partnerID=40&md5=c9efb2d486f64b87bef3dbd0ffbcb877
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9423
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Earth Physics Department, St. Petersburg State University, St. Petersburg, Russian Federation
Recommended Citation:
Divin A.,Semenov V.,Korovinskiy D.,et al. A new model for the electron pressure nongyrotropy in the outer electron diffusion region[J]. Geophysical Research Letters,2016-01-01,43(20).