The old climate change dogma was that solar irradiance only varied by a miniscule amount, roughly 0.1% as measured over the normal 11 year solar cycle. This has caused many scientists to dismiss changes in the Sun’s output as unimportant to climate change here on Earth. But new research is proving this assumption to be shaky at best. In a long online post by NASA in 2013, a good overview of current research into the solar-climate link is presented.
As the online report states: “Of particular importance is the sun’s extreme ultraviolet (EUV) radiation, which peaks during the years around solar maximum. Within the relatively narrow band of EUV wavelengths, the sun’s output varies not by a minuscule 0.1%, but by whopping factors of 10 or more. This can strongly affect the chemistry and thermal structure of the upper atmosphere.”
The full report, “The Effects of Solar Variability on Earth’s Climate,” is available from the National Academies Press. This research and more are causing the tide to turn with regard to climate change and the importance of our local star.