电离层声重波扰动的高频无线电诊断

HF RADIO DIAGNOSTICS OF THE IONOSPHERIC AGW DISTURBANCE

为了充分发挥现代数字式电离层探测仪在电离层结构与优动研究中的潜力,必须在传统的频高图真高换算的基础上,发展新的反演理论和算法.本文介绍了随时空缓变的各向异性电离层介质中无线电波包传播的广义射线方程组,讨论了计算波包射线几何路径以及计算波包参数,如频移、波矢、群时延等沿射线路径变化的传播正问题,并详细讨论了根据波包参量的测定值反演介质结构和扰动伏态的传播反问题.文中若干实验实例表明,这种反演理论和算法可用于数字式电离层探测仪记录的分析,它使高频无线电波探测技术成为研究全球电离层声重波一类扰动的有力工具。

This work is devoted to the numerical solution of radiowave propagation problems arising from the sounding of large scale ionospheric disturbances with modern ionosondes. A set of generalized ray equations is introduced in the approximation of geometric optics as the basis to solve both direct and inverse problems of radio waves propagating in a disturbed and aniso-tropic ionosphere. The inverse problem for diagnosing the ionospheric disturbances is discussed in detail, and the numerical procedure is given to calculate the height profile of both the ionospheric ionization density and the normal velocity of the iso-ionization surface from modern ionosonde measurements. Several experimental data are analyzed. It is concluded that the simple HF radio technique, together with the proposed inversion method, is an important tool in the study of the global ionospheric dynamics, especially the large scale ionospheric disturbances such as acoustic-gravity waves.