Evidence of 6 000-Year Periodicity in Reconstructed Sunspot Numbers

Details Evidence of 6 000-Year Periodicity in Reconstructed Sunspot Numbers Evidence of 6 000-Year Periodicity in Reconstructed Sunspot Numbers

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009soph..257..363x&link_type=abstract

Solar Physics, Volume 257, Issue 2, pp.363-369

Physics

2

Solar Activity, Periodic, Hurst Analysis, Smoothing Filter, Fourier Analysis

Scientific paper

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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