This is an excellent introductory article on solar variation.
Originally posted on Inform The Pundits!:
Something strange, very strange, is happening on the sun. On October 8th, NOAA’s Solar Cycle Progression monthly update report came out.
Sunspot activity has dropped off to its lowest point in over 100 years, perhaps to its lowest since the Dalton Minimum of the early 1800s.
The sun is headed into a quiet phase. The evidence is mounting. Sunspot activity is down. Solar flux is down. The sun’s magnetic field is decreasing linearly toward zero by 2026. The long term trend points towards a less active sun.