A sunspot is a dark area or spot on the surface of the Sun. It is cooler than the surrounding region and appears as a dark spot due to its magnetic activity. Full definition
On a fourth graph, the film - makers altered part of a curve, thereby creating the impression that temperature has precisely tracked changes in sunspot cycles. (monbiot.com)
It showed the trend in sunspot numbers with either the north hemisphere leading the south, or the south hemisphere leading the north. (wattsupwiththat.com)
Both my correlation and Sánchez - Bayo and Green's show snow depth increasing with sunspot number. (gergs.net)