空间等离子体环境中航天器的带电特性

On the Charging Characteristics of Spacecraft in a Space Plasma Environment

通过简化航天器表面建立了一维粒子层模型,基于静电场理论的Poisson方程、等离子体理论的Boltzmann方程和电动力学的动量方程建立了等离子体鞘层动力学模型.利用模型总结了航天器表面带电粒子运动速度、带电粒子密度、航天器表面电位随充电时间的变化规律,分析了空间等离子体环境参数对航天器表面充电电位的影响.研究结果可为航天器带电防护设计提供一定的理论依据.

A one-dimension particle layer model was given by simplifying the spacecraft surface to a plane in this paper. A plasma sheath dynamic model was builder based on the Poisson equation in electrostatic field theory,Boltzmann equation in plasma theory and momentum equation in electromagnetic theory. Using the dynamic model, the variable laws of charged particles＇ movement speed, charged particles＇ density and spacecraft surface potential with charging time was summarized; the effect of the space plasma parameters on the spacecraft surface potential was analyzed. Those researched results will provide a certain theoretical foundation for the spacecraft charging protection design.