22-year cycle or 11-year cycle in the latitude drift of sunspot groups

Details 22-year cycle or 11-year cycle in the latitude drift of sunspot groups 22-year cycle or 11-year cycle in the latitude drift of sunspot groups

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...47..541t&link_type=abstract

Solar Physics, vol. 47, Apr. 1976, p. 541-550.

Physics

13

Drift Rate, Secular Variations, Solar Cycles, Sunspots, Dynamic Characteristics, Latitude, Tables (Data)

Scientific paper

Some earlier investigations seem to indicate that sunspots show an average drift in latitude which varies sinusoidally with the period of the double sunspot cycle (about 22 years) but do not show similar variability with the period of the single sunspot cycle (about 11 years). Other studies show that the drift of sunspots does vary with the period of the single sunspot cycle. The problem is reinvestigated on the basis of long-lived sunspot groups, but treating the material in a way different from before. This procedure, which uses central values of the proper motions of the groups instead of their average values, gives additional proof of the reality of the 11-year period of the drift. It also seems to produce the 22-year period, but there is such a difference between the variabilities of the drift found on the basis of the two methods that the 22-year cycle of the drift is made doubtful.

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