MAVEN Observations of Tailward Reconnection Front in the Martian Magnetotail

被引：7
|
作者：
Lin, R. T. [1 ]
Huang, S. Y. [1 ]
Yuan, Z. G. [1 ]
Jiang, K. [1 ]
Xu, S. B. [1 ]
Wei, Y. Y. [1 ]
Xiong, Q. Y. [1 ]
Zhang, J. [1 ]
Wang, Z. [1 ]
Yu, L. [1 ]
机构：
[1] Wuhan Univ, Sch Elect Informat, Hubei Luojia Lab, Wuhan, Peoples R China
来源：
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2023年 / 128卷 / 02期
基金：
中国国家自然科学基金;
关键词：
ELECTROMAGNETIC ENERGY-CONVERSION; DIPOLARIZATION FRONTS; MAGNETIC RECONNECTION; ION-ACCELERATION; REFLECTION; ELECTRONS; WAVES; FIELD;
D O I：
10.1029/2022JA031030
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Intense electromagnetic energy conversion and local magnetic flux transport occur at reconnection fronts (RFs) formed by magnetic reconnection. Tailward RFs (TRFs), characterized by sharply enhanced negative magnetic field normal components accompanied by tailward plasma flows, are the tailward propagating dipolarization fronts in the Earth's magnetotail. So far RFs and TRFs are observed merely at magnetized planets. Using data from Mars Atmosphere and Volatile EvolutioN, we report, for the first time, the observations of TRF embedded in a current sheet (possibly diffusion region of magnetic reconnection) in the Martian magnetotail. At the TRF, O+ and O-2(+) are accelerated in tailward direction; behind the TRF, the perpendicular electron fluxes enhance at the energy of 251-905 eV, which should be caused by betatron acceleration. The energized plasmas indicate that the electromagnetic energy converts to plasma kinetic energy around the TRF. Our observations suggest that RFs could occur in the planetary magnetotail without the global intrinsic dipole magnetic field.
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页数：11
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