On the distribution of sunspot cycle periods

Details On the distribution of sunspot cycle periods On the distribution of sunspot cycle periods

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9210101w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Sept. 1, 1987, p. 10,101-10,104. NASA-supported research.

Statistics

20

Frequency Distribution, Statistical Distributions, Sunspot Cycle, Histograms, Mode (Statistics), Visual Observation

Scientific paper

A comparison is made between the observed distribution of sunspot cycle periods and distributions based on uniform, normal, and bimodal distributions. The bimodal distribution, composed of short- and long-period cycles, each normally distributed about its respective mean, is found to best describe the observed distribution. Compared to the normal distribution for the most reliably determined cycles (cycles 8 - 20), the bimodal distribution has a residual (sum of squares of differences) that is about 86% smaller. Means for short- and long-period cycles are estimated to be 122±4 months and 140±5 months, respectively.

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