中纬突发E层特性的模拟分析

从基本的连续性方程出发，并结合运动方程，运用特征线方法求解，在合理的动力学假设条件下，模拟金属离子的汇聚，即Es层的形成．模拟的结果在一定程度上证实了风剪切理论的合理性．通过改变风场和电场模式的输入参量，使模拟的结果体现出不同当地时、不同季节的金属离子汇聚情况，讨论了模拟Es层峰值密度对风场和电场的周日和季节变化的响应，其结果与统计得到的Es层出现率的时间分布特征相似．

THE SIMULATION ANALYSIS OF MID-LATITUDE SPORADIC E-LAYERS

The present paper deals with both the computer simulation and statistical study of sporadic E-layers at mid-latitude regions. According to the widely accepted wind shear theory, simulation for the formation of Es under the action of wind fields and electric fields was carried out. The simulation work is based on the continuity equation and momentum equation and method of characteristics curve is adopted. We accomplish simulating the convergence of metal ions to form a thin layer under reasonable dynamics conditions. The wind field data come from the HWM93 empirical model and the electric field data from the drift empirical model. The results of simulation confirm the validity of the wind shear theory indirectly. When changing the input parameter of the HWM93 empirical model and the drift empirical model, we obtained different results, which make it possible for us to study the reaction of Es peak density on the diurnal and seasonal variations of the background dynamics conditions. The results agree with the statistical temporal variation feature of the sporadic E occurrence. After a comparison of data statistic results, the reliable part of the theory is confirmed and its irrationality is discussed.