The article is on-line: https://www.scientificamerican.com/article/the-sunspot-cycle-is-more-intricate-than-previously-thought/
73, Randy, KS4L > On Jul 21, 2018, at 5:47 PM, Dauer, Edward <[email protected]> wrote: > > This month’s Scientific American has an interesting one-page article on > sunspots. The 11-year cycle (the Schwabe cycle) is the one we tend to focus > on, but there are 88 year cycles (the Gleissberg), occasional 200 year peaks > (Suess-DeVries), and a 2,400 year (Hallstatt) cycle as well. The longer > cycles look like modulation envelopes with the shorter cycles constrained > within them. > > It seems from the graphic that we are only a few hundred years off the low of > the 2,400 year cycle as well as suffering the bottom of the 11 year. The > last peak of the 2,400 year looks like it was at about the year 300 CE (a/k/a > AD). So the next Hallstatt peak should be due in around 600 years, if I am > interpolating from the graphics correctly. I should probably replace all the > coax by then. > > The article is non-technical but visually striking. I have no way to post > it, and shouldn’t without SA’s permission anyway; but I can send a pdf copy > by return e-mail attachment if anyone wants one. Request off line please > since this is sort of OT. > > Ted, KN1CBR > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
