Analysis And Research Of Deep Dielectric Charging And Discharging In Spacecraft

Spacecraft in orbit will encounter a variety of space environment because of the effects of the high-energy charged particles. Among them, the deep dielectric charge-discharge is one of the most threatening effects. The process of charge and discharge will have a direct damage to the devices. Meanwhile, the discharge electromagnetic pulse can interfere the normal operation of electronic systems. The research of deep discharge not only can improve the protection of the viability of the spacecraft in the space environment, but also can develop Chinese space activities.Firstly, to evaluate the risk of deep charge, the first thing to know is the orbit the satellites in and the worst electronic environment the orbit has. The paper has established high-energy electron model based FLUMIC and has got the worst geosynchronous energetic electron flux levels.Secondly, electron transport processes inside the material and energy distribution have been shown in different ways. Using the model of RIC to get the electric field distribution within the dielectric material and change the parameters of the material to analyze the material parameter’s effects on deep charging of satellite. To conclude, material density dose have effect but a little; When the conductivity is higher than 111410???? m,deep dielectric charging is no easy to happen; For the material of TEFLON being exposed in GEO orbit, when its thickness gets to 5mm and the electric field can be 7.8×107V/m,finally it can be broken.At the end,According to the characteristic of the charging mode and electric field, the discharge mechanism has been studied in many ways. To solve Maxwell equations with the FDTD method and get the electromagnetic pulse generated under a specific current pulses. The time structure and the power spectrum generated during the discharge have been studied.The results could be used for deep charging analysis and became a basis for charging effects.