Are there periodic solar magnetic cycle changes? Yes.
Quote:
Originally Posted by dmr81 View Post: Your further statement that “The solar Maunder like minimums do appear to follow a 200 year cycle” is absolute rubbish. We’ve only seen one of them — two if you count the Dalton minimum as “Maunder-like” — and to conclude from this that they’re cyclic is the fantasy of an overactive imagination declaring as fact what you wish to be true. I have indeed studied the proxy data, which not only fail to support a genuine periodicity, they actually contradict it. As I said before, there may or may not be pseudoperiodic behavior on that time scale, but claims of genuine periodicity are contradicted by the available evidence.
Forcing of Doubling CO2? Positive or negative Feedbacks?
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dmr81, your comment is not correct. There have been five solar minimums in the last 1000 years. (i.e. One every 200 years.) The Dalton minimum, Maunder minimum, Spörer Minimum, Wolf Minimum, and Oort minimum.
C14 in the atmosphere is inversely proportional to the strength of the solar magnetic cycle. The following image from Wikipedia shows how the solar magnetic cycle strength is the highest in 1200 years. The C14 data on the graph stops around 1980, the current C14 is now around -25, which is particularly impressive as the geomagnetic field intensity has dropped 30% in the last 1000 years.
http://en.wikipedia.org/wiki/Image:C...ity_labels.svg
http://en.wikipedia.org/wiki/Maunder_minimum
This is a link to the actual data that was used to make the graph.
http://www.radiocarbon.org/IntCal04%...s/intcal04.14c