Recurrence of solar activity: Evidence for active longitudes |
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Authors: | Richard S Bogart |
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Institution: | (1) High Altitude Observatory, National Center for Atmospheric Research, 80307 Boulder, Colo., USA;(2) Present address: National Aeronautics and Space Administration, Ames Research Center, 94035 Moffett Field, Calif., USA |
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Abstract: | The autocorrelation coefficients of the daily Wolf sunspot numbers over a period of 128 years reveal a number of interesting features of the variability of solar activity. In addition to establishing periodicities for the solar rotation, the solar activity cycle, and perhaps the Gleissberg Cycle , they suggest that active longitudes do exist, but with much greater strength and persistence in some solar cycles than in others. There is evidence for a variation in the solar rotation period, as measured by sunspot number, of as much as two days between different solar cycles.The National Center for Atmospheric Research is sponsored by the National Science Foundation. |
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