Quote:
Originally Posted by Hornblower
Everything I can find about the Gleissberg cycle puts it closer to 80 years, about half the period you attribute to it.
I did some quick sketches of hypothetical cycles and I can see how your original graph would have emerged from it, if the amplitudes of the 11-year cycles vary with a period somewhere near a century. I would wish to test it by extrapolating it over many centuries, preferably several millenia. If it holds up, then I might wish to contemplate some sort of causality. If it breaks down, I would conclude that the results over the past 260 years are coincidental.
Unfortunately we have no direct observations of sunspots before Galileo's time. Is there any forensic radioisotope evidence that can be attributed to past sunspot cycles with any certainty?
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C / 2004 (37) October 28th, 2004
The Sun is More Active Now than Over the Last 8000 Years
An international team of scientists has reconstructed the Sun's activity over the last 11 millennia and forecasts decreased activity within a few decades
The activity of the Sun over the last 11,400 years, i.e., back to the end of the last ice age on Earth, has now for the first time been reconstructed quantitatively by an international group of researchers...
full paper here (pdf file)
pete