Meridional motions of sunspot groups during eleven activity cycles

Details Meridional motions of sunspot groups during eleven activity cycles Meridional motions of sunspot groups during eleven activity cycles

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..152..221l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 152, no. 1, p. 221-226

Physics

6

Latitude, Solar Cycles, Solar Longitude, Spatial Dependencies, Sunspots, Time Dependence, Translational Motion, Decay Rates, Group Velocity, Vector Analysis

Scientific paper

Greenwich data (1874-1976) are used for a time-dependent analysis of meridional motions of sunspot groups. We obtain the latitude-dependence of meridional motions of sunspot groups with respect to a mean latitude determined for half-year intervals. The daily meridional motions of groups are also given separately for growing and decaying sunspot groups. The development is determined from changes of sunspot areas. Our results are compared with the reductions performed by Howard (1991b) using the Mt. Wilson sunspot data from 1917 until 1985: Although we have smaller errors, we do not find any significant drift. We also do not find different trends in the meridional motions of growing as compared to decreasing sunspots.

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