Recurrence Phenomena in Small Cosmic-Ray Bursts

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Abstract
Chree's method of superposed epochs was employed in the statistical investigation of variations in the frequency of occurrence of small cosmic-ray bursts which produced 2.9 to 3.6 millions of pairs of ions in a shielded spherical ionization chamber of 13.3 liters effective volume containing air at 160 atmospheres. The data employed were obtained by Long and Whaley in the same investigation (during a little more than 18 months in 1938 and 1939) which supplied the data for the author's work on recurrences in variations of cosmic-ray intensity and their relation to geomagnetic and heliophysical activities. The analysis was carried out only for the range of day numbers from -45 to +45. Irregular secondary pulses were found both preceding and subsequent to both positive and negative primary pulses. Both subsequent and preceding difference curves and the combination difference curve displayed secondary pulses with peaks at about 27 days preceding and subsequent to the primary pulses. The secondary pulses amounted to about 3 or 4 percent of the average frequency of approximately 37 small bursts per day, and about 10 percent of the larger variations constituting the primary pulses.

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