Key Laboratory of Lunar and Deep Space Exploration National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 ChinaSchool of Astronomy and Space Sciences University of Chinese Academy of Sciences Beijing 100049 China;
School of Atmospheric Sciences Sun Yat-sen University Zhuhai Guangdong 519082 ChinaCenter for Excellence in Comparative Planetology Chinese Academy of Sciences Hefei 230026 China;
Key Laboratory of Lunar and Deep Space Exploration National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 ChinaCenter for Excellence in Comparative Planetology Chinese Academy of Sciences Hefei 230026 China;
School of Atmospheric Sciences Sun Yat-sen University Zhuhai Guangdong 519082 China;
Mars; MAVEN; photoelectron; Day-to-night transport;