Observation of Electric Field Enhancement at Ion Composition Boundary at Mars and Its Relation to Oxygen Acceleration

被引：0
作者：
Shuvalov, Sergey D. [1 ]
Andersson, Laila [1 ]
Hanley, Kathleen Gwen [2 ]
Halekas, Jasper S. [3 ]
Mitchell, David L. [2 ]
Espley, Jared R. [4 ]
机构：
[1] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
[2] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA USA
[3] Univ Iowa, Dept Phys & Astron, Iowa City, IA USA
[4] NASA, Lab Planetary Magnetospheres, Goddard Space Flight Ctr, Greenbelt, MD USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2025年 / 52卷 / 04期
关键词：
Mars; ion composition boundary; magnetopause; solar wind; SOLAR-WIND INTERACTION; MAVEN; UPSTREAM; PHOBOS-2; WAVES; SHOCK;
D O I：
10.1029/2024GL113584
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Direct electric field measurements during certain ionosphere-magnetosheath transitions on the dayside of Mars reveal a presence of localized (<20 km thickness along vertical direction) strong (>40 mV/m) electric field located at the solar wind stagnation point. This electric field is nearly collocated with the ion composition boundary where ionospheric oxygen ions are observed to be accelerated up to similar to 1 keV, forming a layer of higher temperature plasma around the stagnation point. Simulations demonstrate that the observed localized electric field enhancement can create this hotter plasma layer population on either side of the boundary. This plasma layer can have an impact on the solar wind coupling with the planet and forms a reservoir for heavy ion escape.
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页数：9
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