Evidence of 6 000-Year Periodicity in Reconstructed Sunspot Numbers

  title={Evidence of 6 000-Year Periodicity in Reconstructed Sunspot Numbers},
  author={M. A. Xapsos and E. Burke},
  journal={Solar Physics},
  • M. A. Xapsos, E. Burke
  • Published 2009
  • Physics
  • Solar Physics
  • Reconstructed sunspot data are available that extend solar activity back to 11 360 years before the present. We have examined these data using Hurst analysis, a moving average filter, and Fourier analysis. All of the procedures indicate the presence of a long term (≈6 000 year) cycle not previously reported. A number of shorter cycles formerly identified in the literature by using Fourier analysis, Bayes methods, and maximum entropy methods were also detected in the reconstructed sunspot data. 
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