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Chinese Journal of Space Science ›› 2020, Vol. 40 ›› Issue (6): 1074-1083.doi: 10.11728/cjss2020.06.1074

• Research Articles • Previous Articles    

Statistical Study on the Positive High Potential of Polar Satellite at Low Altitude

HE Yuxuan1,2, LIU Yong1, ZHANG Qiang1,2   

  1. 1 State Key Laboratory of Space Weather, Nation Space Science Center, Chinese Academy of Sciences, Beijing 100190;
    2 University of Chinese Academy of Sciences, Beijing 100049
  • Received:2019-04-24 Revised:2020-03-14 Published:2020-12-09

Abstract: Based on the surface potential data of Polar satellite from 1996 to 2008, a statistical study is presented among the positive high potential of the satellite surface at low altitudes (abnormal events), the solar activity, and the MLT distributions. The main results are as follows. Firstly, the solar radiation positively correlates with the events numbers. The more active the Sun is, the more times abnormal events occur, while the solar radiation does not affect the surface potential of the spacecraft. Secondly, the proportion of abnormal events has seasonal changings. Thirdly, in the high solar activity years, the abnormal events occur more frequently in winter and summer in comparison with spring and autumn. In the low solar activity years, the abnormal events numbers maintain low values in monthly changings, and they have no apparent rules. Fourthly, there are many similarities of abnormal events in hemisphere distributions: the abnormal events do not occur at geomagnetic latitudes between 50° and 60°, but occur more frequently in the polar regions and the dusk sides. However, the abnormal events also have differences in hemispheres distributions: the abnormal events occur more frequently in the southern hemisphere. Lastly, even in the solar maximum year, the abnormal events occurrence rate does not exceed 10%.

Key words: Spacecraft charging, Solar cycle, Photoelectric effect, Magnetic local time

CLC Number: