Observations on extensive air showers II: Time variations in the energy region of 1017eV

Abstract
The rates of arrival of extensive air showers near sea level have been recorded over a period of almost two years. The results show no evidence for sidereal variations in the rates, and the bearing of this in theories of the origin of cosmic radiation is discussed. Evidence is presented of statistically significant variations in solar time for showers containing a mean number of particles of 3 × 107, and the significance of this is briefly discussed.

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