It appears more than likely that climate change is controlled by variations in solar magnetic activity and by periodic changes in ocean circulation. (americanthinker.com)
While there has not been great resistance to Eddy's arguments for a lull in solar magnetic activity during the Maunder Minimum, one of the main reasons why his ideas caught the imagination is more contentious. (stsci.edu)
In addition, the analysis of ionized calcium emission (an indication of solar magnetic activity) can produce TSI estimates. (scientificamerican.com)