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Neutral Heating Efficiency in the Dayside Martian Upper Atmosphere

文献类型：期刊论文

作者Gu, H.5; Cui, J.1,2,4; Niu, D. -D.5; Cao, Y. -T.1; Wu, X. -S.1,2; Li, J.4; Wu, Z. -P.4; He, F.3; Wei, Y.3
刊名ASTRONOMICAL JOURNAL
出版日期2020-02-01
卷号159期号:2页码:13
关键词Upper atmosphere Mars Aeronomy Planetary atmospheres Photoionization Photodissociation regions Astrochemistry
ISSN号0004-6256
DOI10.3847/1538-3881/ab5fcc
英文摘要The neutral heating efficiency is commonly defined as the fraction of the solar extreme ultraviolet and X-ray energy absorbed by a planetary atmosphere that ends up as local heat. It is a crucial parameter that determines the upper atmospheric temperature and, consequently, the thermal escape rate on both solar system bodies and exoplanets. Combining the Mars Atmosphere and Volatile Evolution measurements of a variety of atmospheric parameters, we calculate the neutral heating efficiency in the dayside Martian upper atmosphere based on a complicated network of microscopic processes, including photon and photoelectron impact processes, as well as exothermic chemical reactions. Our calculations indicate that neutral heating is mainly contributed by photon impact at low altitudes, of which the bulk occurs via CO2 photodissociation, and exothermic chemistry at high altitudes, of which the bulk occurs via and dissociative recombination. Collisional quenching of metastable neutrals and ions, which is of great interest in the literature, contributes to local heating by no more than 10% at all altitudes. In the dayside median sense, the neutral heating efficiency remains roughly constant at 20% from 150 to 200 km and increases steadily to 32% near 250 km. The heating efficiency at 150-200 km shows a weak correlation with solar zenith angle, increases modestly with increasing solar activity, and is clearly enhanced over strong crustal magnetic anomalies. Throughout the study, strict local heating is assumed, but nonlocal heating does not affect our results near or below 200 km.
WOS关键词ELECTRON-IMPACT DISSOCIATION ; PHOTOIONIZATION CROSS-SECTIONS ; SOLAR-CYCLE VARIATION ; MONTE-CARLO MODEL ; MAGNETIC-FIELD ; CARBON-DIOXIDE ; COUPLING PHOTOCHEMISTRY ; MAVEN OBSERVATIONS ; ENERGY DEPOSITION ; TITANS ATMOSPHERE
资助项目Chinese Academy of Sciences[XDA17010201] ; pre-research project on Civil Aerospace Technologies - China's National Space Administration[D020105] ; National Science Foundation of China (NSFC)[41525015] ; National Science Foundation of China (NSFC)[41774186] ; NSFC[41525016]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000519137600001
出版者IOP PUBLISHING LTD
资助机构Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China (NSFC) ; NSFC ; Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China (NSFC) ; NSFC ; Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China (NSFC) ; NSFC ; Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China (NSFC) ; NSFC
源URL[http://ir.iggcas.ac.cn/handle/132A11/94049]  
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Gu, H.
作者单位1.Chinese Acad Sci, Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
4.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Guangdong, Peoples R China
5.Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
推荐引用方式
GB/T 7714		 Gu, H.,Cui, J.,Niu, D. -D.,et al. Neutral Heating Efficiency in the Dayside Martian Upper Atmosphere[J]. ASTRONOMICAL JOURNAL,2020,159(2):13.
APA Gu, H..,Cui, J..,Niu, D. -D..,Cao, Y. -T..,Wu, X. -S..,...&Wei, Y..(2020).Neutral Heating Efficiency in the Dayside Martian Upper Atmosphere.ASTRONOMICAL JOURNAL,159(2),13.
MLA Gu, H.,et al."Neutral Heating Efficiency in the Dayside Martian Upper Atmosphere".ASTRONOMICAL JOURNAL 159.2(2020):13.

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来源：地质与地球物理研究所

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