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Bidirectional electron conic observations for photoelectrons in the Martian ionosphere
Cao Yutian1; Cui Jun2; Ni Binbin3; Wu Xiaoshu1; Luo Qiong3; He Zhaoguo2
2020
Source PublicationEarth and Planetary Physics
ISSN2096-3955
Volume4Issue:4Pages:403
AbstractElectron pitch angle distributions similar to bidirectional electron conics (BECs) have been reported at Mars in previous studies based on analyses of Mars Global Surveyor measurements. BEC distribution, also termed “butterfly” distribution, presents a local minimum flux at 90° and a maximum flux before reaching the local loss cone. Previous studies have focused on 115 eV electrons that were produced mainly via solar wind electron impact ionization. Here using Solar Wind Electron Analyzer measurements made onboard the Mars Atmosphere and Volatile Evolution spacecraft, we identify 513 BEC events for 19–55 eV photoelectrons that were generated via photoionization only. Therefore, we are investigating electrons observed in regions well away from their source regions, to be distinguished from 115 eV electrons observed and produced in the same regions. We investigate the spatial distribution of the 19–55 eV BECs, revealing that they are more likely observed on the nightside as well as near strong crustal magnetic anomalies. We propose that the 19–55 eV photoelectron BECs are formed due to day-to-night transport and the magnetic mirror effect of photoelectrons moving along cross-terminator closed magnetic field lines.
KeywordMartian ionosphere photoelectron pitch angle distribution
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/73932
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
Cao Yutian,Cui Jun,Ni Binbin,et al. Bidirectional electron conic observations for photoelectrons in the Martian ionosphere[J]. Earth and Planetary Physics,2020,4(4):403.
APA Cao Yutian,Cui Jun,Ni Binbin,Wu Xiaoshu,Luo Qiong,&He Zhaoguo.(2020).Bidirectional electron conic observations for photoelectrons in the Martian ionosphere.Earth and Planetary Physics,4(4),403.
MLA Cao Yutian,et al."Bidirectional electron conic observations for photoelectrons in the Martian ionosphere".Earth and Planetary Physics 4.4(2020):403.
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