[justa-hairyape]

And what's so special about UV?

Very important. It affects the Ozone Layer for starters. Another NASA scare born from ignorance. A new study also found that it affects the temperature of Earth's outer atmosphere, which ends up causing the outer atmosphere to expand and shrink in volume.

[dr_who]

Why should the sun's output of UV fluctuate any more than most of the visible and IR spectrum (ie a couple of W/m^2)? ?