IGGCAS OpenIR  > 地球与行星物理院重点实验室
Cross-Terminator Variations of the Photoelectron Energy Distribution in the Martian Ionosphere
Cheng, Y. M.1,2; Wu, X. S.3,4; Cui, J.3,4; Cao, Y. T.3; Ni, B. B.5; Wei, Y.6,7
2022-02-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
ISSN2169-9097
Volume127Issue:2Pages:20
AbstractPhotoelectrons are produced on the dayside of Mars via solar Extreme Ultraviolet (EUV) and X-ray ionization and are also frequently observed on the nightside as a result of field-aligned transport. Based on the Solar Wind Electron Analyzer (SWEA) measurements made on board the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft, we show that the shape of the photoelectron energy distribution exhibits interesting cross-terminator variations, in that the He II peak becomes less pronounced and the 10 - 50 eV smooth background becomes hardened, both more evident at lower altitudes. These observations could be understood as the outcome of "atmospheric absorption" via photoelectron collisions with ambient neutrals during day-to-night transport. Such a scenario could successfully interpret the diversity of the MAVEN SWEA observations such as the dawn-dusk and north-south asymmetries, the impacts of crustal magnetization, upstream solar wind conditions, and solar EUV and X-ray radiation, all using the 10-50 eV spectral hardness as a diagnostic. In particular, the magnetic control of the cross-terminator spectral reshaping is proposed as the outcome of varying day-to-night magnetic connectivity which naturally implies varying field-aligned atmospheric column for "absorption." Crude estimates suggest that an "absorbing" atmospheric column of approximate to 1.5 x 10(15) cm(-2) is required for a significant photoelectron spectral reshaping beyond the EUV terminator. Therefore the observations reported here may shed light on the extension of the cross-terminator magnetic field lines, as complementary to the day-to-night magnetic connectivity inferred from the occurrence of nightside photoelectrons.
KeywordMartian ionosphere photoelectrons transport atmospheric absorption MAVEN
DOI10.1029/2021JE007136
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; CAS B-type Strategic Priority Program ; CAS B-type Strategic Priority Program ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; CAS B-type Strategic Priority Program ; CAS B-type Strategic Priority Program ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; CAS B-type Strategic Priority Program ; CAS B-type Strategic Priority Program ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; CAS B-type Strategic Priority Program ; CAS B-type Strategic Priority Program ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration
WOS KeywordSUPRATHERMAL ELECTRON DEPLETIONS ; SOLAR-CYCLE VARIATION ; MARS GLOBAL SURVEYOR ; NIGHTSIDE IONOSPHERE ; PEAKS ; PRECIPITATION ; PREDICTIONS ; DEPENDENCE ; SPECTRA ; WINDS
Language英语
Funding ProjectNational Natural Science Foundation of China[42030201] ; National Natural Science Foundation of China[41904154] ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS)[IGGCAS-201904] ; CAS B-type Strategic Priority Program[XDB41000000] ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration[D020104] ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration[D020105]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; CAS B-type Strategic Priority Program ; CAS B-type Strategic Priority Program ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; CAS B-type Strategic Priority Program ; CAS B-type Strategic Priority Program ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; CAS B-type Strategic Priority Program ; CAS B-type Strategic Priority Program ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; Institute of Geology & Geophysics, Chinese Academy of Sciences (CAS) ; CAS B-type Strategic Priority Program ; CAS B-type Strategic Priority Program ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration ; pre-research projects on Civil Aerospace Technologies - China's National Space Administration
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000765623000017
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105054
Collection地球与行星物理院重点实验室
Corresponding AuthorWu, X. S.
Affiliation1.Chinese Acad Sci, Natl Astron Observ, 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, Planetary Environm & Astrobiol Res Lab PEARL, Sch Atmospher Sci, Zhuhai, Peoples R China
4.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Peoples R China
5.Wuhan Univ, Sch Elect Informat, Dept Space Phys, Wuhan, Peoples R China
6.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing, Peoples R China
7.Univ Chinese Acad Sci, Sch Earth & Planetary Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Cheng, Y. M.,Wu, X. S.,Cui, J.,et al. Cross-Terminator Variations of the Photoelectron Energy Distribution in the Martian Ionosphere[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2022,127(2):20.
APA Cheng, Y. M.,Wu, X. S.,Cui, J.,Cao, Y. T.,Ni, B. B.,&Wei, Y..(2022).Cross-Terminator Variations of the Photoelectron Energy Distribution in the Martian Ionosphere.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,127(2),20.
MLA Cheng, Y. M.,et al."Cross-Terminator Variations of the Photoelectron Energy Distribution in the Martian Ionosphere".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 127.2(2022):20.
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