What do the lines in this NASA graphic represent?
Why does Solar cycle 22 have a peak of nearly 300 (assuming that peak represents the maximum observations at the same time) and this link says the peak is 212)?
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In the above plot by Hathaway, the jagged line peaking at 284.5 in June 1989 is the monthly international sunspot number. The smooth curve starting and ending a few years later is a prediction based on recent observations and statistics of past cycles.
The peak of 212.5 in November 1989 is for a 13-month smoothing of the monthly number. The Sunspot Index and Long-term Solar Observations (SILSO) project at the Royal Observatory of Belgium archives these data and provides this plot of the monthly and smoothed sunspot numbers together.