Abstract

Variations in the parameters of the propagation of decameter waves on two auroral radio paths, Dikson–Pevek (D = 2800 km) and Lovozero–Pevek (D = 4200 km), were studied via oblique ionospheric sounding for two days, one weakly disturbed and one strongly disturbed. The following parameters were analyzed: F₂ MOF and E_s MOF (the maximum observed frequencies when the signal is reflected from the F₂ layer and the E_s layer), F2Spread (diffuse reflection), and lateral reflections. The following new results have been obtained: the F₂ MOF level for the strongly disturbed day is higher than that for the weakly disturbed day on both paths; however, the F₂ MOF values during substorms are either small or absent due to increased absorption. The E_s MOF values on the Dikson–Pevek path increase during the period of disturbances. As for the Lovozero–Pevek path, the probability of E_s reflections decreases during the disturbed day. The diffusion in the F₂ layer on the Dikson–Pevek path is mostly typical for a strongly disturbed period, while that on the Lovozero–Pevek path, conversely, is mostly typical for weakly disturbed conditions. Lateral reflections on the Dikson–Pevek path occur rather rarely. On the Lovozero–Pevek path, there are very few lateral reflections on the weakly disturbed day and no lateral reflections on the strongly disturbed day.

中文翻译：

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不同地磁活动下极光路径上高频无线电波的传播特征

摘要

通过斜向电离层探测了两天，研究了迪卡森-佩维克（D = 2800 km）和洛沃零-佩维克（D = 4200 km）这两个极光无线电路径上十米波传播参数的变化，其中一个弱扰动和一个人很不安。分析了以下参数：F ₂ MOF和E _s MOF（当信号从F ₂层和E _s层反射时的最大观测频率），F 2扩展（漫反射）和横向反射。获得了以下新结果：F ₂在两条路径上，强烈干扰日的MOF均高于弱干扰日的MOF。但是，由于吸收增加，亚暴期间的F ₂ MOF值很小或不存在。在Ë_小号上期间干扰的周期的Dikson-佩韦克路径增加MOF值。至于Lovozero–Pevek路径，在受干扰的一天中E _s反射的可能性会降低。F _2中的扩散在强烈扰动期间，Dikson–Pevek路径上的层通常是典型的，而相反，在弱扰动条件下，Lovozero–Pevek路径上的层通常是典型的。迪克森-佩维克路径上的横向反射很少发生。在Lovozero-Pevek路径上，弱干扰日几乎没有侧向反射，强干扰日没有侧向反射。