A sunspot periodicity and its possible relation to solar rotation

Details A sunspot periodicity and its possible relation to solar rotation A sunspot periodicity and its possible relation to solar rotation

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l.153k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Feb. 1, 1979, p. L153-L156.

Mathematics

Probability

23

Periodic Variations, Power Spectra, Solar Rotation, Sunspots, Least Squares Method, Photosphere, Probability Theory, Statistical Analysis

Scientific paper

A least-squares power-spectrum analysis of 122 years of Zurich daily sunspot numbers yields a statistically significant peak at a 12.0715 + or - 0.002 day period. This feature of the sunspot spectrum may be associated with the peak at 12.22 days (sidereal) which Dicke (1976) found in his oblateness data, and may be attributable to the sun's core if it rotates at either a 12.0715-day or a 24.1430-day period (synodic).

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