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ABSTRACT
The present article describes the characteristics of fading of the radio waves reflected from the ionosphere over Ahmedabad and Thumba during the period January-December 1964. It is found that the rate of fading at Thumba (geog. lat. 8°32'N, geog. long. 76°52'E) is higher than that at Ahmedabad (geog. lat. 23°01'N, geog. long. 72°36'E). The probability distributions of amplitudes at Ahmedabad follow either Rayleigh or Gaussian law whereas at Thumba neither of these is observed; in most of the cases it is exponential. The semi-angle of the cone of down-coming radio waves is larger at Thumba than that at Ahmedabad. In general the fading characteristics at Ahmedabad and Thumba are very different in nature.