Abstract
For many years after the discovery of the Kennelly-Heaviside layer, the ionosphere was assumed to be essentially uniform horizontally. Later the variation from daytime to night-time hemispheres was taken into account, and in this way it was possible to explain a large body of radio phenomena. As a consequence more complex models of ionospheric structure received little attention at that time. By the middle 1930's, however, evidence was beginning to accumulate indicating that the ionosphere is highly irregular in both time and space.
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