Multiple scattering effects in ionospheric radio sounding
Multiple scattering effects in ionospheric radio sounding
复制标题
电离层无线电探测中的多重散射效应
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
E. Kovalenko
中科院分区：
文献类型：
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作者：
N. Zabotin;J. Wright;E. Kovalenko
通过数值计算研究了多次散射对反射信号的角分布和积分强度的影响，讨论了具有随机密度不规则性的电离层等离子体的光学厚度、平面单调层的无线电波反射特性。我们在不变射线坐标中的小角散射近似中使用辐射传输方程的改进解（“SASIRC”）。中纬度电离层条件的情况下，最详细的处理，但也得到了一些结论，纬度的依赖性，垂直和稍微倾斜的探测情况下。早期版本的理论显示出强烈的异常衰减效应的结论得到了证实，并对定量结果进行了调整。我们描述了一个特殊的振幅校准程序估计异常衰减在实际实验中使用dynasonde技术，并讨论了我们的结果的应用，解释电离图扩展F。
Properties of radio wave reflection from an optically thick, plane monotonic layer of ionospheric plasma with random density irregularities are considered by investigating numerically the influence of multiple scattering on the angular distribution and the integral intensity of the reflected signal. We use an improved solution of the radiative transfer equation in the approximation of small‐angle scattering in invariant ray coordinates (“SASIRC”). The case of midlatitude ionosphere conditions is treated in most detail, but some conclusions about latitudinal dependence are also obtained, for both vertical and slightly oblique sounding cases. Conclusions from earlier versions of the theory showing a strong anomalous‐attenuation effect are confirmed, with adjustments of the quantitative results. We describe a special amplitude calibration procedure for estimation of anomalous attenuation in practical experiments using dynasonde techniques, and discuss the application of our results to an explanation of ionogram spread F.