The radiation from our sun is the ultimate source of energy and warmth on earth. Our atmosphere and the earth’s surface is continually bombarded by a wide range of electromagnetic radiation, protons, electrons and cosmic rays, which emanate largely from our sun but also from outer space. The intensity of this radiation varies with sun spot activity which are enormous electromagnetic storm regions that are observed to develop periodically on the surface of the sun.
Historical observation of sun spot activity has shown it to be roughly cyclical in nature, time wise. The interval between maxima is about 11 years and for the big solar cycle of 100 years there are 9 individual 11 year cycles.
The nucleation of clouds from water vapor is thought to be caused by cosmic rays which impinge on the earth from outer space. When sun spot activity is high the increased magnetic field of the sun deflects the cosmic rays from the earth thus causing a lower tendency for cloud formation. Also the greater the UV radiation from the sun results in evaporation of the high altitude ice particles and the cloud cover disappears. In general, periods of high sunspot activity are related to global warming and periods of low sun spot activity with global cooling. http://solarcycle25.com/index.php?tid=13
Minnesotans Calling Gore Out. (A must see).