80- 200 km弱非均匀电离层等离子体中电离声不稳定性的色散关系及其低频解
Towards the dispersion relation for ionacoustic instabilities in weakly inhomogeneous ionospheric plasma at altitudes 80-200km and its low-frequency solution
摘要：
本文在双流体磁流体力学近似和几何光学近似下，建立了三维弱不规则电离层中80- 200 km高度电离层等离子体电离声不稳定性的色散关系。在140 km以上的高度，所得结果与标准结果的差异变得显著。正如在这种情况下的分析所示，解决方案随着时间的推移而增长。这种解存在的条件是存在同向的电子密度梯度和电子漂移，以及视线对磁场的不对称性。必要条件在磁赤道上有规律地存在。详细的分析表明，该解对应于著名的150 km赤道回波，并解释了实验观测到的一些统计特征。
英文摘要：
In the paper within the approximation of the two-fluid magnetohydrodynamics and geometrooptical approximation the dispersion relation was found for ionacoustic instabilities of the ionospheric plasma at 80-200km altitudes in three-dimensional weakly irregular ionosphere. Low freqeuncy solution was found. The difference between obtained and standard solution becomes significant at altitudes above 140 km. As the analysis shown in this case the solution grows with time. The conditions for existence of such solution are the presence of co-directed electron density gradients and electron drifts and perpendicularity of line-of-sight to the magnetic field. The necessary conditions regularly exist at the magnetic equator. Detailed analysis has shown that this solution corresponds to well-known 150km equatorial echo and explains some of its statistical characteristics observed experimentally.
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