A Sunspot Periodicity and Its Possible Relation to Solar Rotation.
Scientific technical rept.,
STANFORD UNIV CALIF INST FOR PLASMA RESEARCH
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A least-squares power-spectrum analysis of 122 years of Zurich daily sunspot numbers yields a statistically significant peak at 12.0715 or - .002 days period. This feature of the sunspot spectrum may be associated with the peak at 12.22 days sideral which Dicke 1976 found in his oblateness data, and may be attributable to the suns core if it rotates at either 12.0715 days or 24.1430 days period synodic. Author