Solar Physics

, Volume 76, Issue 1, pp 155–165 | Cite as

Recurrence of solar activity: Evidence for active longitudes

  • Richard S. Bogart


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.


Autocorrelation Solar Activity Solar Cycle Sunspot Number Activity Cycle 
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Copyright information

© D. Reidel Publishing Co. 1982

Authors and Affiliations

  • Richard S. Bogart
    • 1
  1. 1.High Altitude Observatory, National Center for Atmospheric ResearchBoulderUSA

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