…with the period of ~2500 years in our 2015 blog post: Why Phi? – Jupiter, Saturn and the de Vries cycle (we use 2503y).
Or he might do, if he had read it. More correctly, we agree with him.
In the second paragraph of the introduction in his article of December 1978 in the Astrophysical Journal, which has a rather long title related to the solar cycle, he writes:
“From the earliest study of sunspots, it was noted that the envelope of the solar cycle has undergone a long-term modulation (Wolf 1856, 1862, 1868); Waldmeier (1961).”
The same paragraph ends:
“…other long-term modulations have also been suspected…In particular, the analysis of 14C data over 7500 years by Eddy (1977) strongly suggests that there may be a regular and periodic modulation on the order of 2500 years.”
Our 2015 chart (explained here).
E = Earth years
via Tallbloke’s Talkshop
October 22, 2019 at 02:21PM
Iowa Climate Science Education 