Abstract
A method is described for calculating the electron density distribution in the ionosphere, between two locations, from the information contained in an oblique incidence ionogram. The technique derives an ionospheric profile which yields an oblique ionogram from ray-tracing identical with that obtained by actual measurement. The profile is split into segments, with a particular form of equation representing the variation of electron density with height in each segment. The segment constants are calculated to give the correct ground range and virtual path length for points taken at intervals along the ionogram trace. The technique is readily applicable to monotonic profiles; an approximation is used to deal with re-entrant profiles.
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