Positions of sunspot groups and solar rotation

Details Positions of sunspot groups and solar rotation Positions of sunspot groups and solar rotation

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...74..153t&link_type=abstract

(ESA and European Physical Society, ESLAB Symposium on Physics of Solar Variations, 14th, Scheveningen, Netherlands, Sept. 16-19

Physics

13

Long Term Effects, Solar Oscillations, Solar Rotation, Sunspots, Angular Velocity, Displacement, Latitude, Longitude, Statistical Analysis

Scientific paper

The question is studied whether the one-year solar oscillation found by Chistiakov for the years 1965-1973 can be traced in the observations of sunspots of 1874-1971 published by Greenwich Observatory. The result is negative. But the study leads to the following two conclusions: (1) The average observable centres of gravity of spot groups are variably displaced towards the central meridian or towards the limb, the time scale of this variability being of the order of 70 years. Thus the angular velocity should be determined from recurrent groups in transit of the central meridian only. (2) The angular velocity will be smaller when determined from older spots.

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