用斜探测电离图(P-f)作频率预报

本文分析了斜探测电离图(P-f)。在对测得的电离图判读的基础上给出了最高观测频率MOF的日变化曲线,它可看作为电离层准实时频率预报曲线。图中同时提供了几个重要的电离层预报参数,如MOF、LOF、MUF及E_s的影响等。文章最后把斜测电离图与同时测得的返回散射电离图(在同一张电离图上)结合起来,给出了最佳工作频率窗口,其结果可以作为(在固定线路上)修正长期预报的依据,因为长期预报是用垂测数据经换算得到的。 

The Frequency Prediction by Oblique lonogram

In this paper,experimental results are analysed for HF sweep-frequency backscatter and oblique transmission passing through the ionosphere.The quasi-real-time frequency prediction has been obtained by (P-f) ionogram.Frequency prediction table is given.Several important parameters of the ionosphere can be provided,such as LOF,MOF,MUF and effects of Es etc.The window of optimum operating frequency is given.Both backscatter and oblique ionogram,to be measured together,are discussed.This frequency prediction method can correct long or short term prediction,which is calculated by vertical sounding data,because the former was a quasi-real-time frequency prediction for a fixed communication line.