Sunspot Integral v. Temperature

Accumulated departure from the annualized monthly mean (41.2) observed sunspot numbers 1610-2009 shows declining solar activity during the little ice age (LIA) and increasing solar activity during the subsequent recovery from the LIA. The 11 year moving average, corresponding to the 11-year solar cycle, is also plotted. Note the accelerated increase in solar activity beginning in the 1940s and correlation with land temperature data (HADCRU3 5 year moving average).