An apparent 'even-odd' cycle distribution in Mt. Wilson 'numbers of spots' data

Details An apparent 'even-odd' cycle distribution in Mt. Wilson 'numbers of spots' data An apparent 'even-odd' cycle distribution in Mt. Wilson 'numbers of spots' data

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..106...29w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 106, July 1986, p. 29-33. NASA-USAF-supported research.

Physics

3

Annual Variations, Solar Cycles, Sunspots, Temporal Distribution, Solar Oscillations, Statistical Analysis

Scientific paper

Mt. Wilson 'number of spots' data (as defined in Howard et al., 1984) appear to be distributed according to 'even-odd' cycle numbering. Linear fits of annual 'numbers of spots' versus annual sunspot number for even- and odd-numbered cycles have slopes which are statistically different at the 5% level of significance. The existence of an 'even-odd' split in Mt. Wilson 'numbers of spots' data may be due either to a real difference in even- and odd-numbered cycles on the sun or to a difference in weather at Mt. Wilson (perhaps, related to the 22 yr rhythm of drought in the western United States) during even- and odd-numbered cycles, or both. For cycle 22, an even-numbered cycle, the peak 'numbers of spots' is estimated to be near 2600.

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