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Evidence of 6?000-Year Periodicity in Reconstructed Sunspot Numbers
Authors:M A Xapsos  E A Burke
Institution:(1) NASA Goddard Space Flight Center, Greenbelt, MD, USA;(2) Consultant, Woburn, MA, USA
Abstract: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.
Keywords:Solar activity  periodic  Hurst analysis  Smoothing filter  Fourier analysis
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