Solar Measurements — What do they mean? | K9JY: "Sunspot numbers are shown as a 'tens' number relating to the number of 'regions' on the site and a 'singles' number relating to the number of sunspots associated with a 'region.'
So if there are no sunspots, the number is understandably zero. But, a single sunspot on the sun would translate into a sunspot number of 11. The tens spot for having one region and the singles number for one sunspot in the region."
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