Marsward and tailward ions in the near-Mars magnetotail: MAVEN observations

被引：35

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
]}

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

Curry, S. M. ^{[1
]}

Hara, T. ^{[1
]}

Livi, R. ^{[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] CNRS, IRAP, 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 INTERACTION; MAGNETIC-FIELD; VENUS IONOSPHERE; PLASMA; ASYMMETRIES;

D O I：

10.1002/2015GL065005

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We present Mars Atmosphere and Volatile EvolutioN (MAVEN) observations of Marsward and tailward fluxes of suprathermal (>25 eV) ions in the near-Mars (similar to 1-1.5 Mars radii downstream) magnetotail. Statistical results show that the Marsward proton flux and magnetic field draping pattern are well organized by the upstream motional electric field direction. We observe both significant Marsward proton fluxes and tightly wrapped magnetic field lines in the hemisphere pointed in the opposite direction to the upstream electric field. These characteristics are very similar to those observed at Venus. On the other hand, the net flux of oxygen ions points tailward on average in the Martian tail, while net Venusward flows of oxygen ions were observed frequently in the same hemisphere at Venus. The mechanism by which the Marsward proton flux is produced in the presence of tailward oxygen ion flux remains unclear.

引用

页码：8925 / 8932

页数：8

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