Ion Loss within a Reconnection Exhaust near Mars: MAVEN Observations

被引：2

作者：

Xu, Xiaojun ^{[1
,2
]}

Wang, Xing ^{[1
,2
]}

Zhou, Zilu ^{[1
,2
]}

Chang, Qing ^{[3
]}

Luo, Lei ^{[1
,2
]}

He, Peishan ^{[1
,2
]}

Yi, Siqi ^{[1
,2
]}

Li, Hui ^{[4
,5
]}

机构：

[1] Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China

[2] CNSA Macau Ctr Space Explorat & Sci, Macau, Peoples R China

[3] Shandong Inst Adv Technol SDIAT, Jinan 250100, Shandong, Peoples R China

[4] Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China

[5] Univ Chinese Acad Sci, Beijing, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2023年 / 955卷 / 01期

基金：

中国国家自然科学基金;

关键词：

MAGNETIC RECONNECTION; SOLAR-WIND; MAGNETOPAUSE; MAGNETOTAIL; ESCAPE; O+;

D O I：

10.3847/1538-4357/acdf4a

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present observations from Mars Atmosphere and Volatile EvolutioN of a reconnection exhaust, which was probably not ongoing, in the Martian magnetosheath. The reconnection jet with abundant heavy ions is directed outward to space. The magnetic field lines within the exhaust are found to be draped, suggesting that the reconnection exhaust was detached from the ionosphere and the heavy ions within it escaped from Mars. The dimensionless reconnection rate estimated from proton measurements is about 5.56%. The total oxygen loss rate via the reconnection exhaust is calculated to be 1.3 x 10(21) s(-1). This much lower ion loss rate than that estimated in active magnetic reconnection at the ionopause suggests that the reconnection associated with the reconnection exhaust is not ongoing, so most of the heavy ions have already escaped. Our results demonstrate that magnetic reconnection can directly contribute to the ion loss of Mars. Due to the participation of multiple heavy ions, the characteristics of magnetic reconnection could be very different.

引用

页数：6

共 44 条

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