Much has been written in the popular press attributing solar cycles (sun spots) to forcing weather cycles. The latest inference comes in the form of a QST article (Pg. 90 November 2008) that does not explicitly attribute solar cycles to cause weather and temperature cycles, but does in fact, obliquely infer that sun spot cycles at least in part cause some warming/cooling by their presence or absence. The reference is via Carbon 14, the Maunder and Dalton Minimums and inferred sun spot numbers.
I would like to make several points vis a vis the correlation on cool weather (Maunder etc) and lack of sun spots. Because one observable phenomenon occurs while the second is in play does not prove causality. In fact there is significant data that suggests that sun spots have little to no forcing action with respect to temperature cycles and our earths weather. I submit, via a published paper from 1977 the following:
Further, a second, less rigid but mathematically similar study completed with an additional two solar cycles completed and additional, more modern, math treatments.
This last reference is not a published journal source, however, I find it interesting that both treatments come to similar conclusions albeit separated by 30 years and two solar cycles and much more earth temperature data included.
I believe there is little data to show a causal relationship between solar cycles to warming/cooling trends on our earth. Saying that solar cycles are the primary reason for these temperature cycles is crossing over the line of proven science.
Thanks for reading. Best, Chas W7MAP/5