A Statistical Investigation of Factors Influencing the Magnetotail Twist at Mars

被引：18

作者：

DiBraccio, Gina A. ^{[1
]}

Romanelli, Norberto ^{[1
,2
]}

Bowers, Charles F. ^{[3
]}

Gruesbeck, Jacob R. ^{[1
]}

Halekas, Jasper S. ^{[4
]}

Ruhunusiri, Suranga ^{[4
]}

Weber, Tristan ^{[1
,5
]}

Espley, Jared R. ^{[1
]}

Xu, Shaosui ^{[6
]}

Luhmann, Janet G. ^{[6
]}

Harada, Yuki ^{[7
]}

Dubinin, Eduard ^{[8
]}

Poh, Gang Kai ^{[1
,9
]}

Brain, David A. ^{[10
]}

Curry, Shannon M. ^{[6
]}

机构：

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

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

[3] Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA

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

[5] Howard Univ, Dept Phys & Astron, Washington, DC 20059 USA

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

[7] Kyoto Univ, Grad Sch Sci, Dept Geophys, Kyoto, Japan

[8] Max Planck Inst Solar Syst Res, Gottingen, Germany

[9] Catholic Univ Amer, Washington, DC 20064 USA

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

来源：

GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 12期

关键词：

magnetosphere; Mars; magnetotail; magnetic reconnection; INTERPLANETARY MAGNETIC-FIELD; SOLAR-WIND INTERACTION; MARTIAN MAGNETOTAIL; SEASONAL VARIABILITY; MAVEN OBSERVATIONS; Y-COMPONENT; B-Y; PLASMA; RECONNECTION; DYNAMICS;

D O I：

10.1029/2022GL098007

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Martian magnetotail exhibits a highly twisted configuration, shifting in response to changes in polarity of the interplanetary magnetic field's (IMF) dawn-dusk (B-Y) component. Here, we analyze similar to 6000 MAVEN orbits to quantify the degree of magnetotail twisting (theta(Twist)) and assess variations as a function of (a) strong planetary crustal field location, (b) Mars season, and (c) downtail distance. The results demonstrate that theta(Twist) is larger for a duskward (+B-Y) IMF orientation a majority of the time. This preference is likely due to the local orientation of crustal magnetic fields across the surface of Mars, where a +B-Y IMF orientation presents ideal conditions for magnetic reconnection to occur. Additionally, we observe an increase in theta(Twist) with downtail distance, similar to Earth's magnetotail. These findings suggest that coupling between the IMF and moderate-to-weak crustal field regions may play a major role in determining the magnetospheric structure at Mars.

引用

页数：10

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