Reconstructed sunspot data are available that extend solar activity back to 11360 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 (≈6000 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. © 2009 Springer Science+Business Media B.V.
CITATION STYLE
Xapsos, M. A., & Burke, E. A. (2009). Evidence of 6000-year periodicity in reconstructed sunspot numbers. Solar Physics, 257(2), 363–369. https://doi.org/10.1007/s11207-009-9380-3
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