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

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2025-02-12 DOI:10.1029/2024GL113584

Sergey D. Shuvalov, Laila Andersson, Kathleen Gwen Hanley, Jasper S. Halekas, David L. Mitchell, Jared R. Espley

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Abstract

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 $\sim$ 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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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.