Abstract
An investigation has been carried on, based on a geometric‐optics treatment, of HF and VHF propagation in the ionospheric whispering gallery, with emphasis on long‐range paths between terminal points both embedded in the lower ionosphere and not involving earth surface reflections.The results of the investigation have proven that guided paths at HF and VHF are supported by the lower ionosphere despite sharp day‐to‐night transitions, refractive irregularities, and discontinuities, and have provided enough insight into their properties to allow the detailed design of a satellite‐to‐satellite experiment.
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