Electric Mars: A large trans-terminator electric potential drop on closed magnetic field lines above Utopia Planitia

被引：19

作者：

Collinson, Glyn ^{[1
,2
]}

Mitchell, David ^{[3
]}

Xu, Shaosui ^{[3
]}

Glocer, Alex ^{[1
]}

Grebowsky, Joseph ^{[1
]}

Hara, Takuya ^{[3
]}

Lillis, Robert ^{[3
]}

Espley, Jared ^{[1
]}

Mazelle, Christian ^{[4
,5
]}

Sauvaud, Jean-Andre ^{[4
,5
]}

Fedorov, Andrey ^{[4
,5
]}

Liemohn, Mike ^{[6
]}

Andersson, Laila ^{[7
]}

Jakosky, Bruce ^{[7
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Code 661, Greenbelt, MD 20771 USA

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

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

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

[5] Univ Paul Sabatier, Toulouse, France

[6] Univ Michigan, Space Phys Res Lab, Ann Arbor, MI 48109 USA

[7] Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2017年 / 122卷 / 02期

关键词：

POLAR WIND; PLASMA ACCELERATION; GLOBAL SURVEYOR; VENUS; IONOSPHERE; ESCAPE; ANOMALIES; BOUNDARY; FLUXES; MODEL;

D O I：

10.1002/2016JA023589

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Parallel electric fields and their associated electric potential structures play a crucial role in ionospheric-magnetospheric interactions at any planet. Although there is abundant evidence that parallel electric fields play key roles in Martian ionospheric outflow and auroral electron acceleration, the fields themselves are challenging to directly measure due to their relatively weak nature. Using measurements by the Solar Wind Electron Analyzer instrument aboard the NASA Mars Atmosphere and Volatile EvolutioN (MAVEN) Mars Scout, we present the discovery and measurement of a substantial (Phi(Mars) = 7.7 +/- 0.6 V) parallel electric potential drop on closed magnetic field lines spanning the terminator from day to night above the great impact basin of Utopia Planitia, a region largely free of crustal magnetic fields. A survey of the previous 26 orbits passing over a range of longitudes revealed similar signatures on seven orbits, with a mean potential drop (Phi(Mars)) of 10.9 +/- 0.8 V, suggestive that although trans-terminator electric fields of comparable strength are not ubiquitous, they may be common, at least at these northerly latitudes.

引用

页码：2260 / 2271

页数：12

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