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