Electron Energization by Ion Density Enhancement in the Martian Magnetotail-MAVEN Observations

被引：0

作者：

Xu, Shaosui ^{[1
]}

Mitchell, David L. ^{[1
]}

Halekas, Jasper S. ^{[2
]}

Mcfadden, James P. ^{[1
]}

Fowler, Christopher M. ^{[3
]}

Hanley, Kathleen ^{[1
]}

Dibraccio, Gina A. ^{[4
]}

Mazelle, Christian ^{[5
]}

Akbari, Hassan ^{[4
]}

Curry, Shannon M. ^{[1
]}

机构：

[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[2] Univ Iowa, Dept Phys & Astron, Iowa City, IA USA

[3] West Virginia Univ, Dept Phys & Astron, Morgantown, WV USA

[4] NASA Goddard Space Flight Ctr, Greenbelt, MD USA

[5] Univ Toulouse, IRAP, CNRS, UPS, Toulouse, France

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 975卷 / 02期

基金：

美国国家航空航天局;

关键词：

MARS; ACCELERATION; VARIABILITY; VENUS;

D O I：

10.3847/1538-4357/ad863e

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

It has been long observed at Mars that electron fluxes are enhanced during the tail current sheet crossings, of which the cause is not well understood. We use a novel approach to reveal one of the electron energization mechanisms with observations from the Mars Atmospheric and Volatile EvolutioN (MAVEN) mission. We find the field-aligned potential, derived from comparing electron distribution functions, to be approximately linearly correlated with the logarithmic values of the local total ion density. This is the expected behavior of an ambipolar electrostatic potential. The large amplitude of potential (tens to hundreds of V) is a result of both a significant density gradient (1 order of magnitude) and the high electron temperature (tens of eV) in the tail. Such a mechanism is not limited to ion density enhancements at current sheet crossings but can be present anywhere that large ion density gradients and hot electrons are present.

引用

页数：8

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