Abstract
Abstract The electronic collision frequency at the peak of the F -layer has been measured at Delhi (Geog. Lat. 28°38′N; Geog. Long. 77°13′E) near the time of ground sunrise using the fixed frequency method first employed by Farmer and Ratcliffe (1935). The mean of 42 measurements made during the period October–November 1967, is found to be (3.9 ± 0.2) × 10 3 sec −1 referring to a mean true-height of (290 ± 20) km.
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