空间飞行体与压缩区内等离子体非稳态相互作用的数值模拟

在压缩区内，飞行体天线辐射出的高频调制场影响着等离子体中的电荷分布，而电荷分布的扰动又反过来影响场量，采用FTCS有限差分格式方法，利用二维三分量轴对称，对空间飞行体与压缩区内等离子体非稳态相互作用过程进行数值模拟，得到了电荷密度扰动与电场的变化情况，计算结果表明，这种非线性相互作用可以引起场的塌缩并出现密度空洞，通过对密度空洞变化的探测，可对隐身飞行体进行跟踪。

NUMERICAL SIMULATION OF NON-STEADY INTERACTION BETWEEN MOVING BODIES AND PLASMA IN COMPRESSION REGION

The interaction between a body in space and its plasma environment is one of the basic problems in space plasma physics. In this paper, based on the amplitude transport equation of fast varying field and the low frequency disturbance equation of electron density, the evolutions of the density distribution of charged particles and collapse of electric field have been calculated numerically in two dimensions with three field components under the condition of transverse wave. A numerical result of non-steady interaction between moving bodies and plasma in compression region is presented. In numerical simulation, the FTCS method, i.e. time forward difference and space central difference method, has been used. The results of nu- merical calculation show that the density cavitons and potential solitons are formed due to the modulational instability if the radiation of the antenna as a pump wave source is sufficiently intense. From the distribution of density caviton, the moving body can be traced out by means of observing the structure and intensity of the density caviton although the body may be a stealthy vehicle.