高纬极区D、E层等离子体非相干散射谱研究

Incoherent scattering spectra of plasma in the D,E region of high latitude auroral ionosphere

针对高纬极区D、E层中粒子与中性成份碰撞剧烈的问题,根据Sheffield碰撞等离子体功率谱理论,分别采用离子分布函数的13、16矩近似对非相干散射谱进行了模拟。仿真实验对比分析了不同碰撞频率、电场强度以及不同碰撞频率与回旋频率比值下的功率谱。由于在计算中考虑了碰撞项的影响,所得功率谱更加符合实际情况,相关结论对于高纬极区中低高度电离层的等离子体散射谱研究具有一定的借鉴意义。

Based on the theory of Sheffield on collision plasma spectra, the incoherent scattering spectra of collision plasma are respectively calculated with 13-moment approximation and 16-moment approximation for ion velocity distribution aiming at the issue of dramatic collision between particles and neutral components. Comparativ analysis of the spectra is giv- en with different collision frequency, electric field intensity and ratio of collision frequency to cyclotron frequency through simulation. Due to the consideration of collision effects in com- putation, the derived spectra agree smore with practical situations. The related conclusion has significance in the research on middle-low plasma scattering spectra of high latitude auroral ionosphere.