Ionization Efficiency in the Dayside Martian Upper Atmosphere

doi:10.3847/2041-8213/aabcc6

CORC > 地质与地球物理研究所 > 中国科学院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

	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
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2018-04-20
卷号	857 期号:2
关键词	Planets And Satellites: Atmospheres Planets And Satellites: Individual (Mars)
ISSN号	2041-8205
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)
内容类型	期刊论文
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).