Solar rotation studies using sunspot data /1967-1974/

Details Solar rotation studies using sunspot data /1967-1974/ Solar rotation studies using sunspot data /1967-1974/

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980soph...66..205n&link_type=abstract

Solar Physics, vol. 66, June 1980, p. 205-211.

Physics

3

Astronomical Photography, Photointerpretation, Solar Rotation, Sunspots, Perturbation Theory, Solar Physics

Scientific paper

The solar rotation rate during 1967-1974 was measured from photographic observations of sunspots. The rates derived from isolated single spots and from bipolar groups were 14.38 plus or minus 0.02 and 14.71 plus or minus 0.05 deg per day equatorial sidereal, respectively. Year-to-year fluctuations in the bipolar group rates correlate with fluctuations in the Mt. Wilson spectroscopic rotation rates, while the isolated single spots show smaller, uncorrelated variations. A possible explanation for the fluctuations in the bipolar rates is year-to-year changes in the separation rates of the bipolar groups, rather than changes in the global solar rotation rate. The latter interpretation requires caution because the sunpot rotation rates were derived from a limited amount of data (one month per year), and the rotation rates were reduced to equatorial values assuming a given differential rotation law.

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