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Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization

文献类型：期刊论文

作者Zhang, Q.3,4; Gu, H.5; Cui, J.1,6; Cheng, Y-M3,4; He, Z-G1,6; Zhong, J-H6; He, F.2; Wei, Y.2
刊名ASTRONOMICAL JOURNAL
出版日期2020-02-01
卷号159期号:2页码:6
ISSN号0004-6256
DOI10.3847/1538-3881/ab6297
英文摘要Neutral escape on Mars is well known to be dominated by atomic oxygen (O) escape via the dissociative recombination (DR) of O+ 2, the most abundant ion species in the Martian upper atmosphere. In this study, we suggest an alternative mechanism due to the impact excitation and ionization of CO2 by photoelectrons on the dayside or precipitating solar wind electrons on the nightside. These electron impact (EI) processes are capable of producing hot O atoms via the predissociation of CO2 and CO+ 2 in electronically excited states. An evaluation with the aid of the combined data set accumulated by several instruments on board the Mars Atmosphere and Volatile Evolution spacecraft reveals that CO2 EI makes a non-negligible contribution to total atomic O escape on Mars, with a median EI-to-DR escape flux ratio of 10% on the dayside and 20% on the nightside. CO2 EI is found to be able to drive stronger O escape than atmospheric sputtering, an alternative escape mechanism well studied on Mars. Our results highlight the importance of a neutral escape mechanism largely ignored in previous studies.
WOS关键词UPPER-ATMOSPHERE ; CROSS-SECTIONS ; DISSOCIATIVE RECOMBINATION ; MARTIAN ATMOSPHERE ; MAVEN OBSERVATIONS ; ENERGY DEPOSITION ; ION ; IONOSPHERE ; CO2 ; PRECIPITATION
资助项目Strategic Priority Research Program of the Chinese Academy of Sciences[XDA17010201] ; Strategic Priority Research Program of the Chinese Academy of Sciences[D020105] ; China's National Space Administration ; National Science Foundation of China[41525015] ; National Science Foundation of China[41774186] ; National Science Foundation of China[41525016]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000520440500001
资助机构Strategic Priority Research Program of the Chinese Academy of Sciences ; China's National Space Administration ; National Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; China's National Space Administration ; National Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; China's National Space Administration ; National Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; China's National Space Administration ; National Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/94050]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Zhang, Q.
作者单位1.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China
5.Macau Univ Sci & Technol, Space Sci Inst, Macau, Peoples R China
6.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Q.,Gu, H.,Cui, J.,et al. Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization[J]. ASTRONOMICAL JOURNAL,2020,159(2):6.
APA Zhang, Q..,Gu, H..,Cui, J..,Cheng, Y-M.,He, Z-G.,...&Wei, Y..(2020).Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization.ASTRONOMICAL JOURNAL,159(2),6.
MLA Zhang, Q.,et al."Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization".ASTRONOMICAL JOURNAL 159.2(2020):6.

入库方式： OAI收割

来源：地质与地球物理研究所

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