Magnetotail dynamics at Mars: Initial MAVEN observations

被引：55

作者：

DiBraccio, Gina A. ^{[1
]}

Espley, Jared. R. ^{[1
]}

Gruesbeck, Jacob R. ^{[1
,2
]}

Connerney, John E. P. ^{[1
]}

Brain, David A. ^{[3
]}

Halekas, Jasper S. ^{[4
]}

Mitchell, David L. ^{[5
]}

McFadden, James P. ^{[5
]}

Harada, Yuki ^{[5
]}

Livi, Roberto ^{[5
]}

Collinson, Glyn ^{[1
,6
]}

Hara, Takuya ^{[5
]}

Mazelle, Christian ^{[7
,8
]}

Jakosky, Bruce M. ^{[3
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Solar Syst Explorat Div, Greenbelt, MD 20771 USA

[2] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

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

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

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

[6] Catholic Univ Amer, Inst Astrophys & Computat Sci, Washington, DC 20064 USA

[7] CNRS, Inst Rech Astrophys & Planetol, Toulouse, France

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

来源：

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

关键词：

MAGNETIC-FIELD; PLASMA OBSERVATIONS; ION-ACCELERATION; FLAPPING MOTION; VENUS; ESCAPE; RECONNECTION; JUPITER; SHEET;

D O I：

10.1002/2015GL065248

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report on the complex nature of the induced Martian magnetotail using simultaneous magnetic field and plasma measurements from the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft. Two case studies are analyzed from which we identify (1) repetitive loading and unloading of tail magnetic flux as the field magnitude changes dramatically, exhibiting signatures similar to substorm activity within intrinsic magnetospheres; (2) multiple current sheet crossings indicative of plasma sheet flapping; (3) tailward flowing high-energy planetary ions (O+ and O-2(+)), confined exclusively to the cross-tail current sheet, contributing to atmospheric escape; and (4) signatures of magnetic flux ropes, suggesting the occurrence of tail reconnection. These events illustrate the complexity of the Martian magnetotail as MAVEN provides key observations relevant to the unanswered questions of induced magnetosphere dynamics.

引用

页码：8828 / 8837

页数：10

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