XXIII. The daily variation of the cosmic ray intensity measured near the 1954 sunspot minimum

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Abstract
The solar daily variation of the ionizing component of cosmic radiation has been measured at sea-level by means of unshielded counter telescopes pointing in the north and south directions at a zenith angle of 45” during the years 1948, 1951, 1952, 1953 and 1954. The amplitude of the daily variation has decreased steadily over these years. For several months during 1953 and 1954, the variation showed an anomolous change in phase, the time of maximum intensity occurring during the night. During these months, the amplitude of the daily variation of the nucleonic component of cosmic radiation was found to decrease to a value not significantly different from zero.