Particle-in-Cell Simulation Study on the Floating Potential of Spacecraft in the Low Earth Orbit |
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Authors: | TANG Daotan YANG Shengsheng ZHENG Kuohai QIN Xiaogang LI Detian LIU Qing ZHAO Chengxuan DU Shanshan |
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Affiliation: | TANG Daotan;YANG Shengsheng;ZHENG Kuohai;QIN Xiaogang;LI Detian;LIU Qing;ZHAO Chengxuan;DU Shanshan;Science and Technology on Vacuum & Cryogenics Technology and Physics Laboratory,Lanzhou Institute of Physics;DFH SATELLITE CO.,LTD.; |
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Abstract: | In order to further understand the characteristics of the floating potential of low earth orbit spacecraft,the effects of the electron current collection area,background electron temperature,photocurrent emission,spacecraft wake,and the shape of spacecraft on spacecraft floating potential were studied here by particle-in-cell simulation in the low earth orbit.The simulation results show that the electron current collection area and background electron temperature impact on the floating potential by changing the electron current collection of spacecraft.By increasing the electron current collection area or background electron temperature,the spacecraft will float at a lower electric potential with respect to the surrounding plasma.However,the spacecraft wake affects the floating potential by increasing the ion current collected by spacecraft.The emission of the photocurrent from the spacecraft surface,which compensates for the electrons collected from background plasma,causes the floating potential to increase.The shape of the spacecraft is also an important factor influencing the floating potential. |
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