中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Structural Variability of the Nightside Martian Ionosphere Near the Terminator: Implications on Plasma Sources

文献类型:期刊论文

作者Cao, Y. -T.1,2; Cui, J.1,2,3,4; Wu, X. -S.1,4; Guo, J. -P.3; Wei, Y.5
刊名JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
出版日期2019-06-01
卷号124期号:6页码:1495-1511
ISSN号2169-9097
关键词Martian ionosphere dawn-dusk asymmetry north-south asymmetry day-to-night plasma transport electron precipitation crustal magnetic fields
DOI10.1029/2019JE005970
英文摘要With the aid of the Neutral Gas and Ion Mass Spectrometer measurements made onboard the Mars Atmosphere and Volatile Evolution, we examine the morphology of the nightside Martian ionosphere near the terminator at 150-250km in terms of the extension into darkness for a selected set of ion species: O 2+, NO+, HNO+, N 2+/CO+, CO 2+, and HCO+. Our analysis reveals several interesting characteristics, including the presence of dawn-dusk and north-south asymmetries and the variability among different species. A full interpretation of the Neutral Gas and Ion Mass Spectrometer observations relies on the combination of impact ionization by precipitating electrons and day-to-night plasma transport, as two important sources of plasma in the nightside Martian ionosphere near the terminator. The former partially contributes to the north-south asymmetry, whereas the latter favorably explains not only the dawn-dusk asymmetry but also NO+ and HCO+ as two exceptions which are more extended into darkness as compared to the other species on the dusk side. A comparison between the two plasma sources further indicates that the effect of day-to-night transport tends to be suppressed over the southern hemisphere. The above results highlight the impacts of crustal magnetic fields on the structural variability of the nightside Martian ionosphere near the terminator, manifest as the shielding of precipitating electrons and the suppression of day-to-night transport, both by the presence of strong magnetic anomalies clustering over the southern hemisphere of the planet.
WOS关键词MARS GLOBAL SURVEYOR ; ELECTRON-DENSITY PROFILES ; SOLAR-CYCLE VARIATION ; MAGNETIC-FIELD ; ATMOSPHERE ; MODEL ; VENUS ; PRECIPITATION ; DEPLETIONS ; DEPENDENCE
资助项目National Science Foundation of China[41525015] ; National Science Foundation of China[41774186] ; National Science Foundation of China[41525016]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000477720700002
资助机构National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/92932]  
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.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing, Peoples R China
3.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Peoples R China
4.CAS Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
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Cao, Y. -T.,Cui, J.,Wu, X. -S.,et al. Structural Variability of the Nightside Martian Ionosphere Near the Terminator: Implications on Plasma Sources[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2019,124(6):1495-1511.
APA Cao, Y. -T.,Cui, J.,Wu, X. -S.,Guo, J. -P.,&Wei, Y..(2019).Structural Variability of the Nightside Martian Ionosphere Near the Terminator: Implications on Plasma Sources.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,124(6),1495-1511.
MLA Cao, Y. -T.,et al."Structural Variability of the Nightside Martian Ionosphere Near the Terminator: Implications on Plasma Sources".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 124.6(2019):1495-1511.

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来源:地质与地球物理研究所

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