关于甚低频无线电波在电离层中衰减的计算

ON THE ATTENUATION OF THE VLF RADIO WAVES IN THE EARTH'S IONOSPHERE

对甚低频无线电波在电离层中由碰撞引起的衰减进行了分析计算．利用二维傅里叶变换的方法，导出了衰减量随电子的碰撞频率、波的工作频率和地磁场的方向变化的解析表达式．给出了不同地磁场方向下衰减量随工作频率变化的数值结果．

The attenuation of the VLF radio waves in the Earth's ionosphere is analyzedand computed. Using the Fourier Tansformation, one may obtain the formulation which indicates the attenuation changing with ionospheric collision frequenciesand the geo-magnetic orientations. Numerical results of the relations between theattenuation and the ionospheric collision frequencies under several geo-magneticorientations are given.