摘要: The formation about the path of a meteor regions ionized and neutral atoms meteoric material is investigated from viewpoint kinetic theory. It found that high initial velocity diffusing particles causes trail to quickly reach an “initial radius” which normal diffusion then proceeds. shown reflected signal may for most purposes be computed on assumption reaches this radius instantaneously. value approximately 14 mean-free-paths; it thus greater than trail. at very frequencies reduce amplitude returned under-dense trails by as much 50 db. If heating neglected, effect over-dense marked same heights trails.