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Response of photoelectron peaks in the Martian ionosphere to solar EUV/X-ray irradiance
Wu Xiaoshu1; Cui Jun2; Cao Yutian1; Sun Weiqin2; Luo Qiong3; Ni Binbin3
2020
Source PublicationEarth and Planetary Physics
ISSN2096-3955
Volume4Issue:4Pages:390
AbstractAn important population of the dayside Martian ionosphere are photoelectrons that are produced by solar Extreme Ultraviolet and X-ray ionization of atmospheric neutrals. A typical photoelectron energy spectrum is characterized by a distinctive peak near 27 eV related to the strong solar HeII emission line at 30.4 nm, and an additional peak near 500 eV related to O Auger ionization. In this study, the extensive measurements made by the Solar Wind Electron Analyzer on board the recent Mars Atmosphere and Volatile Evolution spacecraft are analyzed and found to verify the scenario that Martian ionosphere photoelectrons are driven by solar radiation. We report that the photoelectron intensities at the centers of both peaks increase steadily with increasing solar ionizing flux below 90 nm and that the observed solar cycle variation is substantially more prominent near the O Auger peak than near the HeII peak. The latter observation is clearly driven by a larger variability in solar irradiance at shorter wavelengths. When the solar ionizing flux increases from 1 mW·m~(-2) to 2.5 mW·m~(-2), the photoelectron intensity increases by a factor of 3.2 at the HeII peak and by a much larger factor of 10.5 at the O Auger peak, both within the optically thin regions of the Martian atmosphere.
KeywordMars ionosphere photoelectron solar irradiance MAVEN
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/74370
Collection中国科学院国家天文台
Affiliation1.中国科学院国家天文台
2.中山大学
3.武汉大学
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wu Xiaoshu,Cui Jun,Cao Yutian,et al. Response of photoelectron peaks in the Martian ionosphere to solar EUV/X-ray irradiance[J]. Earth and Planetary Physics,2020,4(4):390.
APA Wu Xiaoshu,Cui Jun,Cao Yutian,Sun Weiqin,Luo Qiong,&Ni Binbin.(2020).Response of photoelectron peaks in the Martian ionosphere to solar EUV/X-ray irradiance.Earth and Planetary Physics,4(4),390.
MLA Wu Xiaoshu,et al."Response of photoelectron peaks in the Martian ionosphere to solar EUV/X-ray irradiance".Earth and Planetary Physics 4.4(2020):390.
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