I thought it was too early in the decline of this solar cycle to start seeing days with no sunspots (when the sunspot number is zero), but I was wrong.
There were no sunspots on June 3-6. 2015 had zero spotless days, 2014 had just one, and there were no spotless days in 2012-2013. There were just two spotless days in 2011, so we have already seen twice the number of spotless days that 2011 had. ...
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There were no sunspots on June 3-6. 2015 had zero spotless days, 2014 had just one, and there were no spotless days in 2012-2013. There were just two spotless days in 2011, so we have already seen twice the number of spotless days that 2011 had. ...
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