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Monte Carlo Calculations of Helium Escape on Mars via Energy Transfer from Hot Oxygen Atoms
Gu,Hao1; Cui,Jun1,2,3; Niu,Dandan4; He,Zhaoguo1; Li,Kun1
2020-10-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume902Issue:2
AbstractAbstract Understanding He escape is crucial for deciphering the evolution of the He budget on Mars. A number of viable mechanisms have been proposed to drive He escape, with energy transfer from hot O generally thought to be the dominant one. This study is devoted to a state-of-the-art evaluation of the above process assuming hot O is exclusively produced from the dissociative recombination of O2+ in the Martian ionosphere. A Monte Carlo model is constructed, with model inputs optimized by the recent Mars Atmosphere and Volatile Evolution measurements. The model calculations reveal a dayside He escape flux of (1–2)?×?106 cm?2?s?1 referred to the surface, for a possible range of H2 mixing ratio at an altitude of 80?km from 0 to 40?ppm. The computed He escape flux increases with increasing nascent O energy and decreasing atmospheric H2 and H abundances. The portion of the atmosphere below the exobase is found to make an exceptionally large contribution of 95% to He escape.
KeywordMars Planetary atmospheres Upper atmosphere Exosphere Aeronomy
DOI10.3847/1538-4357/abb6e9
Language英语
WOS IDIOP:0004-637X-902-2-abb6e9
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/62136
Collection中国科学院国家天文台
Corresponding AuthorCui,Jun
Affiliation1.Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, Guangdong, People’s Republic of China; cuijun7@mail.sysu.edu.cn
2.Chinese Academy of Sciences Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Beijing, People’ Republic of China
3.Chinese Academy of Sciences Center for Excellence in Comparative Planetology, Hefei, Anhui, People’s Republic of China
4.Space Science Institute, Macau University of Science and Technology, Macau, People’s Republic of China
Recommended Citation
GB/T 7714
Gu,Hao,Cui,Jun,Niu,Dandan,et al. Monte Carlo Calculations of Helium Escape on Mars via Energy Transfer from Hot Oxygen Atoms[J]. The Astrophysical Journal,2020,902(2).
APA Gu,Hao,Cui,Jun,Niu,Dandan,He,Zhaoguo,&Li,Kun.(2020).Monte Carlo Calculations of Helium Escape on Mars via Energy Transfer from Hot Oxygen Atoms.The Astrophysical Journal,902(2).
MLA Gu,Hao,et al."Monte Carlo Calculations of Helium Escape on Mars via Energy Transfer from Hot Oxygen Atoms".The Astrophysical Journal 902.2(2020).
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