The 12.2 day solar rotational period

Details The 12.2 day solar rotational period The 12.2 day solar rotational period

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..547d&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Dec. 1, 1977, p. 547-551. NSF-supported research.

Statistics

15

Solar Cycles, Solar Oblateness, Solar Rotation, Periodic Variations, Statistical Analysis, Variance (Statistics)

Scientific paper

The periodicity of the 1966 solar oblateness residuals, representing most of the variance, has been accounted for as a signal generated by a solar distortion rotating rigidly with a 12.22 + or - 0.12 day period (sidereal). It is shown that the complex noiselike character of the curve for residual variance versus frequency (including the numerous secondary resonances) is to be expected and represents the true 'fingerprint' of the 12.2-day distortion signal.

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