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Abnormal Dawn-Dusk Asymmetry of Protonated Ions in the Martian Ionosphere

文献类型：期刊论文

作者Cui, J.2; Ren, Z-P3; Wu, Z-P2,4; Wu, X-S4,5; Hao, Y-Q1; Wei, Y.3
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2020-06-01
卷号895期号:2页码:6
关键词Solar system astronomy Solar system planets Solar system Inner planets Mars Atmospheric variability Atmospheric composition Upper atmosphere Aeronomy Atmospheric science Planetary science Planetary atmospheres
ISSN号2041-8205
DOI10.3847/2041-8213/ab930c
英文摘要Normally, the Martian ionosphere displays a dusk enhancement due to continuous depletion of plasma via recombination during day-to-night transport. Using the extensive measurements made by the Neutral Gas and Ion Mass Spectrometer on board the Mars Atmosphere and Volatile Evolution spacecraft, we show that several species, including H-2(+), OH+, H2O+, and NH+, present instead an abnormal dawn enhancement above the exobase where they are mainly produced by ion-neutral reactions involving H-2. Such a peculiarity is indicative of a dawn bulge of H-2 present in the Martian upper atmosphere and corona, which is driven by subsidence in regions of horizontal wind convergence and the subsequent buildup of minor atmospheric species with large vertical scale heights. A similar dynamical process is also known to occur in the upper atmospheres of other solar system bodies such as the Earth, Venus, and Titan. Interestingly, despite that the diurnal variations of O and N are subject to the same dynamical effect, a dawn enhancement is not seen for O+ and N+, possibly due to the nonthermal production of their parent atoms in the ambient atmosphere via processes such as photodissociation and dissociative recombination. The H-2 distribution inferred in this study is important for a thorough understanding of hydrogen escape and climate evolution on Mars.
WOS关键词MARS ; HYDROGEN ; VARIABILITY ; ATMOSPHERE
资助项目B-type Strategic Priority Program - Chinese Academy of Sciences[XDB41000000] ; China's National Space Administration[D020105] ; China's National Space Administration[D020103] ; National Science Foundation of China t[41525015] ; National Science Foundation of China t[41774186] ; National Science Foundation of China t[41874179] ; National Science Foundation of China t[41904154] ; National Science Foundation of China t[41525016]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000540536700001
出版者IOP PUBLISHING LTD
资助机构B-type Strategic Priority Program - Chinese Academy of Sciences ; China's National Space Administration ; National Science Foundation of China t ; B-type Strategic Priority Program - Chinese Academy of Sciences ; China's National Space Administration ; National Science Foundation of China t ; B-type Strategic Priority Program - Chinese Academy of Sciences ; China's National Space Administration ; National Science Foundation of China t ; B-type Strategic Priority Program - Chinese Academy of Sciences ; China's National Space Administration ; National Science Foundation of China t
源URL[http://ir.iggcas.ac.cn/handle/132A11/96883]  
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Cui, J.
作者单位1.Beijing Univ, Sch Earth & Space Sci, Beijing, Peoples R China
2.Sun Yat Sen Univ, Sch Atmospher Sci, Planetary Environm & Astrobiol Res Lab PEARL, Zhuhai, Guangdong, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
4.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China
5.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Cui, J.,Ren, Z-P,Wu, Z-P,et al. Abnormal Dawn-Dusk Asymmetry of Protonated Ions in the Martian Ionosphere[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,895(2):6.
APA Cui, J.,Ren, Z-P,Wu, Z-P,Wu, X-S,Hao, Y-Q,&Wei, Y..(2020).Abnormal Dawn-Dusk Asymmetry of Protonated Ions in the Martian Ionosphere.ASTROPHYSICAL JOURNAL LETTERS,895(2),6.
MLA Cui, J.,et al."Abnormal Dawn-Dusk Asymmetry of Protonated Ions in the Martian Ionosphere".ASTROPHYSICAL JOURNAL LETTERS 895.2(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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