Three years’ data for the heights and critical frequencies of the F1 and F2 regions at Huancayo, Peru, are examined for lunar tides. Semi-diurnal lunar tides are found in all quantities save f0F1. It is found that the lunar variation in the F2 region depends on solar time in both phase and amplitude. At certain solar epochs it attains very large amplitudes, up to 60 km. in hmax.F2 and 28% in f0F2. The theory of these variations, originated in a previous paper, is further developed.
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David Forbes Martyn (1947) studied this question.