Interesting, and I think worth looking at.
However...our sun has been in a relatively quiet phase for the last couple of years, bottom of the sunspot cycle, bottoming out in 2009. It is only just waking back up to resume the cycle. Seems to me that if CCD was cause by this that it would have been worst around 2001 at the last peak.
Unless it had more to do with the lack of storms and sunspots, seems 2009 was the worst for CCD when there were very few sunspots, haven't heard near as much about it since.