NAOC Open IR
Ionization Efficiency in the Dayside Martian Upper Atmosphere
Cui, J.1,2,3; Wu, X. -S.2; Xu, S. -S.4; Wang, X. -D.5; Wellbrock, A.6,7; Nordheim, T. A.8; Cao, Y. -T.2; Wang, W. -R.2; Sun, W. -Q.3; Wu, S. -Q.9; Wei, Y.10
2018-04-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume857Issue:2Pages:7
AbstractCombining the Mars Atmosphere and Volatile Evolution measurements of neutral atmospheric density, solar EUV/X-ray flux, and differential photoelectron intensity made during 240 nominal orbits, we calculate the ionization efficiency, defined as the ratio of the secondary (photoelectron impact) ionization rate to the primary (photon impact) ionization rate, in the dayside Martian upper atmosphere under a range of solar illumination conditions. Both the CO2 and O ionization efficiencies tend to be constant from 160. km up to 250. km, with respective median values of 0.19 +/- 0.03 and 0.27 +/- 0.04. These values are useful for fast calculation of the ionization rate in the dayside Martian upper atmosphere, without the need to construct photoelectron transport models. No substantial diurnal and solar cycle variations can be identified, except for a marginal trend of reduced ionization efficiency approaching the terminator. These observations are favorably interpreted by a simple scenario with ionization efficiencies, as a first approximation, determined by a comparison between relevant cross sections. Our analysis further reveals a connection between regions with strong crustal magnetic fields and regions with high ionization efficiencies, which are likely indicative of more efficient vertical transport of photoelectrons near magnetic anomalies.
Keywordplanets and satellites: atmospheres planets and satellites: individual (Mars)
Funding OrganizationNational Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants ; National Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants ; National Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants ; National Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants
DOI10.3847/2041-8213/aabcc6
WOS KeywordCRUSTAL MAGNETIC-FIELD ; SOLAR-WIND INTERACTION ; MARS ; PHOTOELECTRONS ; MODEL ; MAVEN ; IONOSPHERE ; ANOMALIES ; REGIONS ; WAVES
Language英语
Funding ProjectNational Science Foundation of China[41525015] ; National Science Foundation of China[41774186] ; National Science Foundation of China[41525016] ; Science and Technology Development Fund of Macau SAR[039/2013/A2] ; Science and Technology Development Fund of Macau SAR[119/2017/A3] ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants[ST/K000977/1] ; STFC consolidated grants[ST/N000722/1]
Funding OrganizationNational Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants ; National Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants ; National Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants ; National Science Foundation of China ; Science and Technology Development Fund of Macau SAR ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000430632600003
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/35627
Collection中国科学院国家天文台
Corresponding AuthorCui, J.
Affiliation1.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Guangdong, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
3.Macau Univ Sci & Technol, Lunar & Planetary Sci Lab, Macau, Peoples R China
4.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
5.Swedish Inst Space Phys, Kiruna, Sweden
6.Univ Coll London, Mullard Space Sci Lab, Dorking, Surrey, England
7.Univ Coll London Birkbeck, Ctr Planetary Sci, London, England
8.CALTECH, Jet Prop Lab, Pasadena, CA USA
9.Beihang Univ, Sch Space & Environm, Beijing, Peoples R China
10.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Cui, J.,Wu, X. -S.,Xu, S. -S.,et al. Ionization Efficiency in the Dayside Martian Upper Atmosphere[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,857(2):7.
APA Cui, J..,Wu, X. -S..,Xu, S. -S..,Wang, X. -D..,Wellbrock, A..,...&Wei, Y..(2018).Ionization Efficiency in the Dayside Martian Upper Atmosphere.ASTROPHYSICAL JOURNAL LETTERS,857(2),7.
MLA Cui, J.,et al."Ionization Efficiency in the Dayside Martian Upper Atmosphere".ASTROPHYSICAL JOURNAL LETTERS 857.2(2018):7.
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