Differential solar rotation depends on solar activity

Details Differential solar rotation depends on solar activity Differential solar rotation depends on solar activity

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.280..299c&link_type=abstract

Nature, vol. 280, July 26, 1979, p. 299, 300.

Physics

21

Solar Activity Effects, Solar Rotation, Sunspots, Sunspot Cycle

Scientific paper

Evidence that the differential rotation of the sunspots at high and low solar latitudes depends on solar activity is presented. The daily angular sidereal motions of long-lived unipolar (isolated) sunspots of sizes from 30 to 300 millionths of the visible solar disk were measured for the sunspot peaks of 1883-85 and 1956-58. A least-squares fit to the time-averaged differential rotation law for sunspots reveals that the equatorial rotation rate remained essentially constant between the activity maxima, however the rotation of high latitude spots is slowed at higher levels of solar activity. The observations were also used to confirm to a good approximation the accepted values of the inclination of the solar equator to the ecliptic and the longitude of the ascending node of the solar equator on the ecliptic.

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