Differential rotation and meridional motions of sunspots in the years 1940-1968

Details Differential rotation and meridional motions of sunspots in the years 1940-1968 Differential rotation and meridional motions of sunspots in the years 1940-1968

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....92..111b&link_type=abstract

Astronomy and Astrophysics, vol. 92, no. 1-2, Dec. 1980, p. 111-116.

Physics

85

Solar Rotation, Sunspot Cycle, Sunspots, Solar Physics, Solar Temperature

Scientific paper

Using positions of sunspots from the Greenwich Photoheliographic Results from 1940 to 1968 equations for the differential rotation and meridional motions of sunspot groups are determined. The differential rotation depends on the phase in the solar cycle and on the type of the groups. The meridional motions show a general southdrift of the spots, but they are not significantly different from zero. The significance of the equatorward motion near the equator found by Ward (1965) seems to be due to an effect of selection. Changes of the meridional motions with time are not in good agreement with former publications, but they are also not significant. A dependence of the meridional motions on the local activity is not detectable.

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