AMPLITUDE VARIATIONS OF THE REFLECTED SIGNAL DURING VERTICAL SOUNDING OF THE IONOSPHERE AT MIDDLE LATITUDES

K. Yusupov, J. Mathews, T. Maruyama, A. Akchurin, M. Tolstikov, O. Sherstyukov, E. Filippova, A. Safiullin
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引用次数: 3

Abstract

In this paper, we discuss the main types of quasiperiodic variations in amplitudes of a reflected signal during vertical sounding of the ionosphere at middle latitudes. The initial experimental data is vertical sounding ionograms obtained by the Cyclone ionosonde. The ionosonde is located in Kazan (59°, 49°) and in standard mode allows us to receive one ionogram per minute. In the analysis, methods are used to visualize a large flow of ionograms in the form of final summary maps of the state of the ionosphere (A-, H-, As-maps). We give typical examples of quasiperiodic variations in amplitudes of a reflected signal in ionograms and on A-maps for various types of multipath beatings (polarization and due to signal scattering by ionospheric irregularities). Frequency properties of such beatings are used to estimate the difference in virtual reflection heights between modes of different polarizations with high accuracy, which makes it possible to refine the form of the electron density profile of the lower ionosphere. We have detected a phenomenon rare for the mid-latitude Es layer — beatings of two O modes with different virtual reflection heights. We also present features of quasiperiodic variations in amplitudes of a reflected signal on traces of the transient Es layer. We study possible causes of the appearance of such beatings.
中纬度电离层垂直探测时反射信号的振幅变化
本文讨论了中纬度电离层垂直探测时反射信号振幅准周期变化的主要类型。初始实验数据是气旋式电离层探测仪获得的垂直探测电离层图。离子探空仪位于喀山(59°,49°),在标准模式下,我们可以每分钟接收一个离子图。在分析中,使用方法以电离层状态的最终总结图(a -, H-, as -图)的形式将大量电离层图可视化。我们给出了电离图和a图中反射信号振幅准周期变化的典型例子,用于各种类型的多径振荡(极化和由于电离层不规则性引起的信号散射)。利用这种振荡的频率特性,可以高精度地估计不同极化模式之间虚反射高度的差异,从而可以细化电离层下层电子密度分布图的形式。我们发现了一种在中纬度Es层罕见的现象——两个虚反射高度不同的O模式的跳动。我们还提出了在瞬态Es层的迹路上反射信号振幅的准周期变化的特征。我们研究这种殴打出现的可能原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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