计入带电粒子入射角度对次级电子效应影响时航天飞行器的带电特性

本文采用由实验得到的带电粒子入射角度对次级电子的影响关系,根据轨道限制电流收集理论,导出了不同几何形体航天器的次级电子数通量表达式;并按局部电流平衡模型,计算了航天器背阴面的带电电位。结果表明,计入带电粒子入射角的影响后,航天器表面负电位的数值有一定减少。因此,在计算航天器表面带电时,应当考虑这种影响。

THE PROPERTIES OF SPACECRAFT CHARGING IN CONSIDERATION OF EFFECTS OF ANGLES OF INCIDENCE OF CHARGED PARTICLES ON THE SECONDARY ELECTRON EMISSION

In this paper, the relationships of effects induced by different angles of incidence of charged particles on the secondary electron emission,which are based on experimental data, are applied. On the basis of the theory of orbit-limited currents, the expressions of number fluxes of secondary electron emission with these effects for spacecrafts of different shapes are obtained. Also, according to the local current balance model, the shaded-side spacecraft potentials under the condition of no photoelectrons are calculated. Comparing these calculation results with those without the effects, the negative potentials are decreased to some extent. When calculating the practical spacecraft charging, these effects should be considered.