This new paper has done some interesting analysis, similar to what we’ve seen done here on WUWT by Willis Eschenbach. It will be interesting to see what he and our resident solar physicist, Dr. Leif Svalgaard have to say about it.
QUASI 500-YEAR CYCLE SIGNALS IN SOLAR ACTIVITY
Lihua Ma, Zhiqiang Yin & Yanben Han – National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
Direct observations of solar activity are available for the past four century, so some proxies reflecting solar activity such as 14C, 10Be and geomagnetic variations are used to reconstruct solar activity in the past. In this present paper, the authors use rectified wavelet power transform and time-averaged wavelet power spectrum to investigate long-term fluctuations of the reconstructed solar activity series. The results show an obvious quasi 500-year cycle exists in the past solar activity. Three reconstructed solar…
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