Magnetic reconnection in the near-Mars magnetotail: MAVEN observations

被引：58

作者：

Harada, Y. ^{[1
]}

Halekas, J. S. ^{[2
]}

McFadden, J. P. ^{[1
]}

Mitchell, D. L. ^{[1
]}

Mazelle, C. ^{[3
,4
]}

Connerney, J. E. P. ^{[5
]}

Espley, J. ^{[5
]}

Larson, D. E. ^{[1
]}

Brain, D. A. ^{[6
]}

Andersson, L. ^{[6
]}

DiBraccio, G. A. ^{[5
]}

Collinson, G. A. ^{[5
]}

Livi, R. ^{[1
]}

Hara, T. ^{[1
]}

Ruhunusiri, S. ^{[2
]}

Jakosky, B. M. ^{[6
]}

机构：

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

[2] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[3] IRAP, CNRS, Toulouse, France

[4] Univ Toulouse 3, F-31062 Toulouse, France

[5] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[6] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2015年 / 42卷 / 21期

关键词：

SOLAR-WIND; FLUX ROPES; FIELD; PLASMA; REGION; TAIL;

D O I：

10.1002/2015GL065004

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report Mars Atmosphere and Volatile EvolutioN (MAVEN) observations of electrons, ions, and magnetic fields which provide comprehensive demonstration of magnetic reconnection signatures in the Martian magnetotail. In the near-Mars tail current sheet at X-MSO similar to-1.3R(M), trapped electrons with two-sided loss cones were observed, indicating the closed magnetic field topology. In the closed field region, MAVEN observed Hall magnetic field signatures and Marsward bulk flows of H+, O+, and O-2(+) ions, which suggest the presence of X lines tailward from the spacecraft. Velocity distribution functions of the reconnection outflow ions exhibit counterstreaming beams separated along the current sheet normal, and their bulk velocities in the outflow direction inversely depend on ion mass. These characteristics are in qualitative agreement with previous multispecies kinetic simulations. The near-Mars magnetotail provides a unique environment for studying multi-ion reconnection.

引用

页码：8838 / 8845

页数：8

共 50 条

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