Cycle latitude effects for sunspot groups

Details Cycle latitude effects for sunspot groups Cycle latitude effects for sunspot groups

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..135..327h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 135, Oct. 1991, p. 327-337.

Physics

22

Astronomical Photography, Latitude, Sunspot Cycle, Digital Data, Solar Rotation

Scientific paper

Digitized Mount Wilson sunspot data from 1917 to 1985 are analyzed to examine meridional motion and rotation properties as a function of latitude and distance from the average latitude of activity in each hemisphere. Latitude dependence similar to previous results is found, but only for spot groups whose areas are decreasing from one day to the next. A previous study of active region magnetic fields, using this technique of motions as a function of the average latitude of activity, had shown meridional motions on average toward the average latitude of activity. In this analysis of spot data some evidence is seen for motion away from the average latitude of activity, with some slight evidence for faster rotation equatorward of the average latitude of activity and slower motion poleward of the average latitude of activity, similar to the torsional oscillation phenomenon. For reasons that are not clear, both of these effects are significantly more pronounced for sunspot groups whose areas are decreasing.

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