Graph of Sunspot Counts

Randy Russell/UCAR, using data from NOAA's NGDC
This graph shows the number of sunspots counted each year for several decades. Notice how the sunspot count rises and falls in an 11-year cycle.
Randy Russell/UCAR, using data from NOAA's NGDC
This graph shows the number of sunspots counted each year for several decades. Notice how the sunspot count rises and falls in an 11-year cycle.