Analysis of the internal charging data in medium earth orbit with numerical simulation and ground experiment

作     者：SONG SiYu CHEN HongFei YU XiangQian ZOU Hong ZONG QiuGang CHEN Ao SHI WeiHong YE YuGuang SONG SiYu;CHEN HongFei;YU XiangQian;ZOU Hong;ZONG QiuGang;CHEN Ao;SHI WeiHong;YE YuGuang

作者机构：Institute of Space Physics and Applied TechnologySchool of Earth and Space SciencesPeking UniversityBeijing 100871China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2022年第65卷第4期

页      面：977-986页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 41374181) the Beijing Municipal Natural Science Foundation (Grant No. 3184048) 

主　　题：deep dielectric charging effect monitor internal charging effect charging currents and potentials medium earth orbit space environment 

摘      要：The deep dielectric charging effect monitor(DDCEM)has been designed to study the internal charging effect by measuring the charging currents and potentials inside the spacecraft.It is equipped on three Chinese navigation satellites in a circular medium earth orbit(MEO)with 22000 km average height and 55°inclinations.Numerical simulation based on the Geant4-RIC method was used to evaluate the data of DDCEM.The data during May to November 2019 on one of the three satellites show that the charging currents of DDCEM were negatively enhanced when the satellite moved into the outer radiation belt.The currents reached the negative maximum during a significant electron enhancement in September 2019.Positive currents were also detected besides negative currents that were caused by the deposition of electrons in the sensor.The causation of positive currents in the space environment may be that the low-energy electrons cannot penetrate the satellite skin and make it charging to negative potential,the reference ground of DDCEM that is connected to the satellite skin drops below zero by the low-energy electrons so that the output currents turn to positive.Ground experiment was used to simulate the causation of positive currents and the result verified our theory.