低电离层反射结构的日变化模型

A DIURNAL-VARYING REFLECTION MODEL FOR LOWER IONOSPHERE

本文提出了日出日落过渡期低电离层的运动斜曲面反射模型。结合白天和晚上的球面反射结构,形成了一个完整的低电离层反射结构日变化模型。提出了反射区的概念,从而使已有的球面电离层反射的天波场强计算公式改进为积分形式,更适于一般情况。文中计算了M台-青岛路径和M台-新乡路径一跳低频天波场强幅度和相位的日变化值,并与实验结果进行了比较分析。

A model of lower ionosphere with non-spherical surface moving horizontally is proposed for wave reflection during sunrise and sunset. Combined with spheric surface for reflaection during day and night, this model can be made quite perfect to explain the well-known diurnal variation of reflection from lower ionosphere. A concept about reflection region is presented, upon which the formulae for calculating field-strength of sky wave are modified to be the integral form and they can be applied in more general cases. Finally, the amplitude and phase, as well as their diurnal variation, for sky wave propagation at LF band by one-skip mode on two paths are calculated. One path is from station M to Qindao, the other is from station, M to Xinxiane. The results are analysed and compared with the experiments.