First Resolved Observations of the Demagnetized Electron-Diffusion Region of an Astrophysical Magnetic-Reconnection Site

被引：51
|
作者：
Scudder, J. D. [1 ]
Holdaway, R. D. [1 ]
Daughton, W. S. [2 ]
Karimabadi, H. [3 ]
Roytershteyn, V. [3 ]
Russell, C. T. [4 ]
Lopez, J. Y. [1 ]
机构：
[1] Univ Iowa, Iowa City, IA 52442 USA
[2] Los Alamos Natl Lab, Los Alamos, NM 87544 USA
[3] Univ Calif San Diego, La Jolla, CA 92093 USA
[4] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 22期
基金：
美国国家科学基金会;
关键词：
SIMULATIONS; INSTRUMENT;
D O I：
10.1103/PhysRevLett.108.225005
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Spatially resolved, diagnostic signatures across the X-line and electron-diffusion region (EDR) by the Polar spacecraft are reported at Earth's magnetopause. The X-line traversal has a local electron's skin depth scale. First, resolved EDR profiles are presented with peak electron thermal Mach numbers >1: 5, anisotropy >7, calibrated electron agyrotropy >1, and misordered expansion parameters indicative of demagnetization and strong (150 eV) increases in electron temperature. The amplitude and phase of these profiles correlate well with a guide geometry kinetic simulation of collisionless magnetic reconnection. Such high resolution diagnosis has been made possible by data processing techniques that afford an 11-fold reduction in the aliasing time for the electron moments.
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页数：5
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