STUDY OF HF FREQUENCIES FOR EXO-AND ENDO-IONOSPHERIC COMMUNICATIONS Open PDF Document Details Document Type Technical Report Publication Date Jul 12, 1962 Accession Number AD0278296 Entities People Mario D. Grossi Richard C. Gunther Organizations RTX Tags Communities of Interest Space DTIC Thesaurus Topics Artificial Satellites Communication Systems Computer Programs Computers Discontinuities Electron Density Frequency Ionosphere Ionospheric Propagation Line Of Sight Magnetic Fields Radio Waves Ray Tracing Refractive Index Spacecraft Vehicles Waveforms