Recurrence Phenomena in Cosmic-Ray Intensity

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Abstract
The adaptation of Chree's method of analyzing geomagnetic data, as carried out by Monk and Compton for their Mexican cosmic-ray data, has been applied to cosmic-ray intensity measurements at Boulder, Colorado. Secondary pulses in the cosmic-ray intensity are apparent in the difference curves. These occur at approximately 28-day intervals both before and after the primary pulse, in good agreement with the findings of Monk and Compton, but the Boulder pulses are somewhat smaller and more irregular. Within the four (previous and subsequent) pulse intervals investigated, magnitudes of the secondary pulses do not appear to depend upon the interval from the primary pulse.