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Hydrogen and helium escape on Venus via energy transfer from hot oxygen atoms
Gu, Hao1; Cui, Jun1,2,3; Niu, Dandan4; Yu, Jiang1
2021-02-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume501Issue:2Pages:2394-2402
AbstractDue to the relatively strong gravity on Venus, heavy atmospheric neutrals are difficult to accelerate to the escape velocity. However, a variety of processes, such as the dissociative recombination of ionospheric O-2(+), are able to produce hot atoms which could deliver a significant amount of energy to light neutrals and drive their escape. In this study, we construct a Monte Carlo model to simulate atmospheric escape of three light species, H, H-2, and He, on Venus via such a knock-on process. Two Venusian background atmosphere models are adopted, appropriate for solar minimum and maximum conditions. Various energy-dependent and species-dependent cross-sections, along with a common strongly forward scattering angle distribution, are used in our calculations. Our model results suggest that knock-on by hot O likely plays the dominant role in driving total atmospheric hydrogen and helium escape on Venus at the present epoch, with a significant portion contributed from regions below the exobase. Substantial variations are also revealed by our calculations. Of special interest is the modelled reduction in escape flux at high solar activities for all species, mainly associated with the enhancement in thermal O concentration near the exobase at high solar activities which hinders escape. Finally, model uncertainties due to several controlling factors, including the distribution of relevant light species in the background atmosphere, the plane-parallel approximation, and the finite O energy distribution, are evaluated.
Keywordplanets and satellites: atmospheres planets and satellites: individual: Venus
Funding OrganizationChinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Key Research Program - Institute of Geology & Geophysics, CAS ; Key Research Program - Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Key Research Program - Institute of Geology & Geophysics, CAS ; Key Research Program - Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Key Research Program - Institute of Geology & Geophysics, CAS ; Key Research Program - Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Key Research Program - Institute of Geology & Geophysics, CAS ; Key Research Program - Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies
DOI10.1093/mnras/staa3744
WOS KeywordUPPER-ATMOSPHERE ; SOLAR-WIND ; MARS ; IONOSPHERE ; THERMOSPHERE ; RATES ; DISTRIBUTIONS ; ENERGIZATION ; EXOSPHERE ; PLASMA
Language英语
Funding ProjectChinese Academy of Sciences (CAS)[XDB41000000] ; Key Research Program - Institute of Geology & Geophysics, CAS[IGGCAS-201904] ; National Natural Science Foundation of China[41525015] ; National Natural Science Foundation of China[41774186] ; National Natural Science Foundation of China[42020301] ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies[D020105]
Funding OrganizationChinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Key Research Program - Institute of Geology & Geophysics, CAS ; Key Research Program - Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Key Research Program - Institute of Geology & Geophysics, CAS ; Key Research Program - Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Key Research Program - Institute of Geology & Geophysics, CAS ; Key Research Program - Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Key Research Program - Institute of Geology & Geophysics, CAS ; Key Research Program - Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies ; China's National Space Administration through the Preresearch Project on Civil Aerospace Technologies
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000608475600057
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79757
Collection中国科学院国家天文台
Corresponding AuthorCui, Jun
Affiliation1.Sun Yat Sen Univ, Sch Atmospher Sci, Planetary Environm & Astrobiol Res Lab PEARL, Zhuhai 519082, Guangdong, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Lunar & Deep Space Explorat, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei 230026, Anhui, Peoples R China
4.Harbin Inst Technol, Inst Space Sci & Appl Technol, Shenzhen 518055, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Gu, Hao,Cui, Jun,Niu, Dandan,et al. Hydrogen and helium escape on Venus via energy transfer from hot oxygen atoms[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,501(2):2394-2402.
APA Gu, Hao,Cui, Jun,Niu, Dandan,&Yu, Jiang.(2021).Hydrogen and helium escape on Venus via energy transfer from hot oxygen atoms.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,501(2),2394-2402.
MLA Gu, Hao,et al."Hydrogen and helium escape on Venus via energy transfer from hot oxygen atoms".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 501.2(2021):2394-2402.
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