IGGCAS OpenIR  > 地球与行星物理院重点实验室
Abnormal Dawn-Dusk Asymmetry of Protonated Ions in the Martian Ionosphere
Cui, J.1; Ren, Z-P2; Wu, Z-P1,3; Wu, X-S3,4; Hao, Y-Q5; Wei, Y.2
2020-06-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume895Issue:2Pages:6
AbstractNormally, 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.
KeywordSolar system astronomy Solar system planets Solar system Inner planets Mars Atmospheric variability Atmospheric composition Upper atmosphere Aeronomy Atmospheric science Planetary science Planetary atmospheres
DOI10.3847/2041-8213/ab930c
Funding OrganizationB-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
WOS KeywordMARS ; HYDROGEN ; VARIABILITY ; ATMOSPHERE
Language英语
Funding ProjectB-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]
Funding OrganizationB-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
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000540536700001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/96883
Collection地球与行星物理院重点实验室
Corresponding AuthorCui, J.
Affiliation1.Sun Yat Sen Univ, Sch Atmospher Sci, Planetary Environm & Astrobiol Res Lab PEARL, Zhuhai, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
5.Beijing Univ, Sch Earth & Space Sci, Beijing, Peoples R China
Recommended Citation
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.
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