[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)? ?

[justa-hairyape]

Don't know what you linked there, but I do not download files from links like that. Can you point to a web page ? Again, as I explained. The visible light metric is a poor metric to use to analyze solar activity variations. Real simple. Dark area cancel light area. Got it ?

[justa-hairyape]

Perhaps an illustration will help. A random image I selected from 2001 March 21st and the one for 2009 December 31st. This is Extreme Ultra Violet. Very energetic radiation.