Cross-Terminator Variations of the Photoelectron Energy Distribution in the Martian Ionosphere
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
 |
| 出版日期 | 2022-02-01 |
| 卷号 | 127期号:2页码:20 |
| 关键词 | Martian ionosphere photoelectrons transport atmospheric absorption MAVEN |
| ISSN号 | 2169-9097 |
| DOI | 10.1029/2021JE007136 |
| 英文摘要 | Photoelectrons 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. |
| WOS关键词 | SUPRATHERMAL ELECTRON DEPLETIONS ; SOLAR-CYCLE VARIATION ; MARS GLOBAL SURVEYOR ; NIGHTSIDE IONOSPHERE ; PEAKS ; PRECIPITATION ; PREDICTIONS ; DEPENDENCE ; SPECTRA ; WINDS |
| 资助项目 | National 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] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000765623000017 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | 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 ; 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/105054]  |
| 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 | Wu, X. S. |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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