Abstract
Measurements of small scale fluctuations in the day time F-region critical frequency over Delhi have revealed the presence of internal gravity waves in the F-region of the ionosphere with periods ranging from 8 to 70 min. The amplitude spectrum of these fluctuations is not uniform but contains two maxima and a minimum. The minimum is found to lie between 25 and 35 min period. It is suggested that this apparent dip in the spectrum is not due to some mechanism which filters out the gravity waves of these particular periods but represents the manner in which the gravity waves manifest themselves in the ionosphere over Delhi (dip angle 42.4°). This view, suggested by Sterling, Hooke and Cohen from their recent studies, is confirmed by the above experimental findings at Delhi.
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