Abstract
The calculation of the true heights of reflection of radio waves in the ionosphere from the variation of the virtual height of reflection with frequency is discussed for parabolic electron-density distributions. The existing theory is extended to include the case of reflections from contiguous parabolic sections or truncated parabolae, and a convenient basic expression is derived giving the variation of virtual height with frequency in terms of the layer parameters. It is shown that expressions developed by other workers are special cases of this more general expression. Methods are indicated whereby the true critical frequency of a truncated layer may be calculated in terms of the observed cusp frequency and it is shown that the analysis may be applied to give a rapid method of obtaining the layer parameters.
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