Solar Diurnal Variation of Cosmic-Ray Intensity as a Function of Latitude

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Abstract
The cosmic-ray data collected by A. H. Compton and R. N. Turner on the Pacific Ocean from March 17, 1936 to January 18, 1937 have been analyzed for a possible change with latitude of the solar diurnal intensity variation. A new geomagnetic latitude curve is shown based on these data and designed to remove periodic fluctuations due to unequal distribution of data with time. A method of combining data from a wide latitude range is developed and applied. Solar diurnal variation curves for latitudes ranging from 54.7° N to 40° S (geomagnetic) show no substantial variation in either amplitude or phase. The mean amplitude of the first harmonic of a Fourier analysis is found to be 0.24 percent with time of maximum being 14 hr. 06 min.

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