期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 13, 页码 6724-6733出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL069205
关键词
magnetic reconnection; electron demagnetization; finite gyroradius effects; electron diffusion region
资金
- Swedish National Space Board [23/12:2, 175/15]
- CNES
- CNRS
We present observations of asymmetric magnetic reconnection showing evidence of electron demagnetization in the electron outflow. The observations were made at the magnetopause by the four Magnetospheric Multiscale (MMS) spacecraft, separated by approximate to 15km. The reconnecting current sheet has negligible guide field, and all four spacecraft likely pass close to the electron diffusion region just south of the X line. In the electron outflow near the X line, all four spacecraft observe highly structured electron distributions in a region comparable to a few electron gyroradii. The distributions consist of a core with T-vertical bar>T and a nongyrotropic crescent perpendicular to the magnetic field. The crescents are associated with finite gyroradius effects of partly demagnetized electrons. These observations clearly demonstrate the manifestation of finite gyroradius effects in an electron-scale reconnection current sheet.
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