Annual American (relative) sunspot numbers collected from 1945 to 2007. The annual (relative) sunspot number is a weighted average of solar activities measured from a network of observatories.
The format is: Time-Series [1:61] from 1945 to 2005: 32.3 99.9 170.9 166.6 174.1 ...
"Time Series Analysis, with Applications in R" by J.D. Cryer and K.S. Chan
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