"Forbush decreases" are probably getting a bit technical for many readers of this blog but they refer to short periods (a few days) when the earth is hit by fewer cosmic rays (no relation to me) than usual. And why is that important? Because Svensmark has shown that cosmic ray fluctuations affect cloud formation and hence global warming. Clouds are a major influence on the temperature underneath them.
So whether cloud cover varies during Forbush events would seem to be a good test of Svensmark's theory. A recent German paper has claimed that Forbush events did NOT influence cloud cover so therefore Svensmark is wrong.
I have not yet seen any comment from skeptics on the paper concerned so I think I might say a word or two until more expert heads than mine get to work.
Basically, the paper seems pretty silly. They sent an aircraft up to observe the cloud cover over just a few areas of central Europe. But it is GLOBAL data that is needed to test the theory. Local weather influences can easily swamp small effects from cosmic rays -- and it is small effects that the Warmists are talking about. Their "hockey stick" graphs (for instance) are normally scaled in tenths of one degree.
Lubos Motl had some sage words about Forbush events last year.
Posted by John Ray (M.A.; Ph.D.). For a daily critique of Leftist activities, see DISSECTING LEFTISM. To keep up with attacks on free speech see TONGUE-TIED. Also, don't forget your daily roundup of pro-environment but anti-Greenie news and commentary at GREENIE WATCH . Email me here