IGGCAS OpenIR  > 地球与行星物理院重点实验室
Structural Variability of the Nightside Martian Ionosphere Near the Terminator: Implications on Plasma Sources
Cao, Y. -T.1,2; Cui, J.1,2,3,4; Wu, X. -S.1,4; Guo, J. -P.3; Wei, Y.5
2019-06-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
ISSN2169-9097
Volume124Issue:6Pages:1495-1511
AbstractWith 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.
KeywordMartian ionosphere dawn-dusk asymmetry north-south asymmetry day-to-night plasma transport electron precipitation crustal magnetic fields
DOI10.1029/2019JE005970
Funding OrganizationNational Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China
WOS KeywordMARS GLOBAL SURVEYOR ; ELECTRON-DENSITY PROFILES ; SOLAR-CYCLE VARIATION ; MAGNETIC-FIELD ; ATMOSPHERE ; MODEL ; VENUS ; PRECIPITATION ; DEPLETIONS ; DEPENDENCE
Language英语
Funding ProjectNational Science Foundation of China[41525015] ; National Science Foundation of China[41774186] ; National Science Foundation of China[41525016]
Funding OrganizationNational Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000477720700002
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92932
Collection地球与行星物理院重点实验室
Corresponding AuthorCui, J.
Affiliation1.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
Recommended Citation
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.
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