电离层Es离子分布数值建模

从离子连续性方程和动量方程出发，比较全面地考虑了太阳光电离、星光电离、地冕电离、星际背景电离和流星离子流等电离源，综合分析Es层的主要动力学过程和光化学过程，以风剪切理论为基础，研究中性成分碰撞、电场作用、金属离子作用和分子离子作用等机制对离子分布的影响，建立了一维时变电离层Es物理模型.对离子产生率、垂直方向的离子速度在高度和时间上的变化进行仿真和计算，得到了在电场及风剪切作用下的离子密度剖面24h内的变化规律.根据建立的模型，以昆明相干散射雷达观测的径向风结果作为模型输入参考，仿真并得到了电离层Es电子密度的时空分布，据此反演出电离层Es临界频率f₀E_s.与昆明站电离层测高仪同时间观测的情况进行对比，结果比较一致，验证了建立的Es层物理模型正确性.

Numerical Modeling of Ion Contributions in Ionospheric Sporadic-E Layerormalsize

The ionospheric kinetic numerical model is expressed as the solution to the temporal evolution of the electron density profile. The ion continuity and the momentum equations, the solar ionization, star ionization, coronal ionization, interstellar background ionization and meteor ion flow are all considered. The main kinetic process and photochemical process of Es layer are analyzed synthetically. The effects of neutral component collision, electric field, metal ion and molecular ion on the ion distribution are also included. In the paper, a one-dimensional time-dependent model of the ionospheric Es has been developed on the basis of the wind shear theory. The ion production rate and the distribution of the vertical ion velocity in height and time are simulated by the model. The variations of ion density profile in 24 hours are also obtained. According to the observation results of winds by coherent scattering radar in Kunming station, the time and space dependent of electron density of Es (N_e) is acquired by the model. Then the f₀E_s are given by the conversion of N_e, and the retrieval results are in good agreement with the contemporaneous ionosonde data in Kunming.