Abstract
The experimental data on the daily variation in cosmic-ray intensity are first surveyed. It appears to be established by Rau's experiments that the energetic meson component at sea level shows a marked semi-diurnal variation which is in phase with the semi-diurnal variation shown by the barometric pressure. Several authors have suggested that this phenomenon is explicable in terms of the Pekeris theory of atmospheric oscillations. The implications of this explanation on the process of meson formation are here examined quantitatively. It is concluded that the explanation is only possible if mesons arise mainly at about 60 or 70 km. above sea level, which is highly unlikely since the corresponding cross-section for meson production would be much larger than appears plausible.
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