Comment on Solar discussion thread II by Jim Cripwell

I remembered. Not stricly what you are looking for, but try

http://www.thegwpf.org/the-observatory/3836-new-paper-on-cosmic-rays-and-diurnal-temperature-change.html

This is the effect on diurnal temperature range during Forbush Decreases. So it is solar wind and coronal mass ejections, not GCRs. But the effect on the earth is similar. HTH.