Solar Galactic control of terrestrial climate

The above picture shows the large heliosphere (in fading yellow) surrounding the small yellow sun from which the solar wind moves outward and opposes the galactic cosmic rays entering the heliosphere and earth's atmosphere.  The galactic rays provide a source of nuclei, charged particles, for moisture droplets to build upon and thus contribute to the earths low cloud cover.  This 11 year oscillation cycle, caused by the interaction of the solar flares against the galactice/cosmic rays as shown in the charts below, is a major controlling factor of the variation of the earths climate.

Each Solar flare from the sun causes a Decrease in cosmic/galactic rays.  (Global Climate 2 ) And with increased frequency of solar flares an 11 year cycle, on average, occures from nearly none to well over 250 per month. The flares cause a decrease in cosmic /galactic rays as shown by the graph below, in sync but oposite to the sunspot number cycle. (Sunspots are the dark spots on the sun resulting from each solar flare).

 

During solar storms there is an increased magnetic field contained with large coronal mass ejections (CMEs) and the smaller solar flares from the sun that sweep past the earth and sweep away a considerable amount of electrically- charged cosmic rays that would otherwise strike the earth. Since the solar storms occur in cycles of approximately 11 years and also have varying intensities their effect on the earths atmosphere and cloud cover varies with the same periodicity and intensity. There is voluminous data of this phenomenon. When CMEs occur the cosmic/galactic rays are decreased similarly to the 11 year cycle of solar flares but the effect of a CME lasts only days up to perhpaps 2 weeks. The data from these two phenomonon continues to increase from the National Aeronautical Space Administration (NASA), the European Space Agency (ESA) and from other researchers around the world.
See a description of this phenomenon  ( Called the Forbush decrease) by NASA at: Forbush Decrease
http://science.nasa.gov/science-news/science-at-nasa/2005/07oct_afraid/