Does rainfall vary with sunspot activity?
By Anil Ananthaswamy THE sun is nearly 150 million kilometres away, but it seems to have Earth’s rivers on a leash. The flow of a huge South American river – and thus the rainfall that feeds it – appears to rise and fall with the number of sunspots. Though scientists reject the climate sceptics’ assertion that the sun’s activity can explain global warming, many have wondered whether it can affect rainfall. No one has been able to test this, though,