This paper examines the properties of the ~2300-year periodicity in the galactic
cosmic radiation, previously recognized in power spectra of cosmogenic 10Be
and 14C. It shows that the periodicity consists of short episodes (50-100 year)
of high cosmic ray intensity, such as accompanied the Spoerer and Maunder
Minima, separated by long intervals (>1000years) of low intensities similar to,
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