10.1007/s11207-009-9380-3
https://zenodo.org/records/1232840
oai:zenodo.org:1232840
Xapsos, M. A.
M. A.
Xapsos
Burke, E. A.
E. A.
Burke
Evidence of 6 000-Year Periodicity in Reconstructed Sunspot Numbers
Zenodo
2009
2009-05-27
Creative Commons Zero v1.0 Universal
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.