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 |
DOI | 10.1029/2019JE005970 |
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 |
推荐引用方式 GB/T 7714 | 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. |
入库方式: OAI收割
来源:地质与地球物理研究所
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