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Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization
Zhang,Q.1,2; Gu,H.3; Cui,J.4,5; Cheng,Y.-M.1,2; He,Z.-G.4,5; Zhong,J.-H.4; He,F.6; Wei,Y.6
2020-01-20
Source PublicationThe Astronomical Journal
ISSN0004-6256
Volume159Issue:2
AbstractAbstract Neutral escape on Mars is well known to be dominated by atomic oxygen (O) escape via the dissociative recombination (DR) of , 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 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.
KeywordPlanetary atmospheres Upper atmosphere Electron impact ionization
DOI10.3847/1538-3881/ab6297
Language英语
WOS IDIOP:0004-6256-159-2-ab6297
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28716
Collection中国科学院国家天文台
Affiliation1.Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, People’s Republic of China
2.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing, People’s Republic of China
3.Space Science Institute, Macau University of Science and Technology, Macau, People’s Republic of China
4.School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, Guangdong, People’s Republic of China
5.Chinese Academy of Sciences Center for Excellence in Comparative Planetology, Hefei, Anhui, People’s Republic of China
6.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, People’s Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang,Q.,Gu,H.,Cui,J.,et al. Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization[J]. The Astronomical Journal,2020,159(2).
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.The Astronomical Journal,159(2).
MLA Zhang,Q.,et al."Atomic Oxygen Escape on Mars Driven by Electron Impact Excitation and Ionization".The Astronomical Journal 159.2(2020).
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