Ionization Efficiency in the Dayside Martian Upper Atmosphere
文献类型:期刊论文
作者 | 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 |
刊名 | ASTROPHYSICAL JOURNAL LETTERS |
出版日期 | 2018-04-20 |
卷号 | 857期号:2 |
ISSN号 | 2041-8205 |
关键词 | Planets And Satellites: Atmospheres Planets And Satellites: Individual (Mars) |
DOI | 10.3847/2041-8213/aabcc6 |
文献子类 | Article |
英文摘要 | Combining 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. |
WOS关键词 | CRUSTAL MAGNETIC-FIELD ; SOLAR-WIND INTERACTION ; MARS ; PHOTOELECTRONS ; MODEL ; MAVEN ; IONOSPHERE ; ANOMALIES ; REGIONS ; WAVES |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000430632600003 |
资助机构 | National Science Foundation of China(41525015 ; National Science Foundation of China(41525015 ; Science and Technology Development Fund of Macau SAR(039/2013/A2 ; Science and Technology Development Fund of Macau SAR(039/2013/A2 ; NASA MAVEN project through the Mars Exploration Program ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants(ST/K000977/1 ; STFC consolidated grants(ST/K000977/1 ; 41774186 ; 41774186 ; 119/2017/A3) ; 119/2017/A3) ; ST/N000722/1) ; ST/N000722/1) ; 41525016) ; 41525016) ; National Science Foundation of China(41525015 ; National Science Foundation of China(41525015 ; Science and Technology Development Fund of Macau SAR(039/2013/A2 ; Science and Technology Development Fund of Macau SAR(039/2013/A2 ; NASA MAVEN project through the Mars Exploration Program ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants(ST/K000977/1 ; STFC consolidated grants(ST/K000977/1 ; 41774186 ; 41774186 ; 119/2017/A3) ; 119/2017/A3) ; ST/N000722/1) ; ST/N000722/1) ; 41525016) ; 41525016) ; National Science Foundation of China(41525015 ; National Science Foundation of China(41525015 ; Science and Technology Development Fund of Macau SAR(039/2013/A2 ; Science and Technology Development Fund of Macau SAR(039/2013/A2 ; NASA MAVEN project through the Mars Exploration Program ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants(ST/K000977/1 ; STFC consolidated grants(ST/K000977/1 ; 41774186 ; 41774186 ; 119/2017/A3) ; 119/2017/A3) ; ST/N000722/1) ; ST/N000722/1) ; 41525016) ; 41525016) ; National Science Foundation of China(41525015 ; National Science Foundation of China(41525015 ; Science and Technology Development Fund of Macau SAR(039/2013/A2 ; Science and Technology Development Fund of Macau SAR(039/2013/A2 ; NASA MAVEN project through the Mars Exploration Program ; NASA MAVEN project through the Mars Exploration Program ; STFC consolidated grants(ST/K000977/1 ; STFC consolidated grants(ST/K000977/1 ; 41774186 ; 41774186 ; 119/2017/A3) ; 119/2017/A3) ; ST/N000722/1) ; ST/N000722/1) ; 41525016) ; 41525016) |
源URL | [http://ir.iggcas.ac.cn/handle/132A11/88332] |
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.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 |
推荐引用方式 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). |
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). |
MLA | Cui, J.,et al."Ionization Efficiency in the Dayside Martian Upper Atmosphere".ASTROPHYSICAL JOURNAL LETTERS 857.2(2018). |
入库方式: OAI收割
来源:地质与地球物理研究所
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