哨声模波通过低纬电离层传播的某些特征

本文采用IGRF(1980)模型进行了哨声模三维射线跟踪计算, 研究了夜间哨声通过低纬电离层传播的射线与波法的特征.着重讨论了形成非导管哨声可透射路径的条件、射线的聚焦效应及射线的低纬截止.数值计算得到路径终纬度截止约在倾角纬度10.7°N. 

Some Characteristics of Whistler Mode Waves Propagating Through the Low-latitude Ionosphere

In this paper, the propagation characteristics for rays and wave normals of VLFradio waves through the low-latitude ionosphere based on the 3-Dray tracing computation carried out for whistler mode waves are investigated by using an IGRF (1980) model. It is found that the ray paths of whistlers detectable on the ground can stably remain in a region around geom. lat. 10° for various ionospheric profiles, and that the downcoming rays focus remarkably in the same region, with a focus gain about 10.4 dB Besides, the results of computation show that the lowest latitudes of non-ducted whistler paths exhibit sharp cut-off near geom. lat. 6.5°.