Abstract
It is normally assumed that the diffraction pattern formed by a radio wave reflected from the ionosphere moves with twice the horizontal velocity of the ionospheric irregularities. This is shown to be equivalent to the statement that if the source of waves is displaced a certain distance, the whole diffraction pattern is displaced by the same amount in the opposite direction. This has been tested by switching a transmitter rapidly from one aerial to another, and observing the displacement of the diffraction pattern by the use of an array of 89 receiving aerials. In this way the standard ‘point source effect’ has been shown to be valid for waves totally reflected from the E-layer, and for waves partially and totally reflected from the E s -layer.
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