DURING the years 1938 and 1939 fixed-frequency pulse observations were being used to record continuously the virtual height and echo intensity of reflexions from the F-region at two frequencies close to the vertical penetration frequency for the region. It was noticed that, in the daytime, the penetration frequency often showed quasi-periodic fluctuations with periods of the order of half an hour. The magnitude of the fluctuation was variable but frequently of the order of 1 Mc./s. from maximum to minimum.
Nature, 162, 886 (1948).
Proc. Inst. Rod. Eng. (Nov. 1947).
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A statistical study of internal gravity wave characteristics using the combined Irkutsk Incoherent Scatter Radar and Digisonde data
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