Monthly Sunspot Numbers, 1749–1983
Monthly mean relative sunspot numbers from 1749 to 1983. Collected at
Swiss Federal Observatory, Zurich until 1960, then Tokyo Astronomical
A time series of monthly data from 1749 to 1983.
Andrews, D. F. and Herzberg, A. M. (1985)
Data: A Collection of Problems from Many Fields for the
Student and Research Worker.
New York: Springer-Verlag.
sunspot.month has a longer (and a bit different) series,
sunspot.year is a much shorter one. See there for
getting more current sunspot numbers.
plot(sunspots, main = "sunspots data", xlab = "Year",
ylab = "Monthly sunspot numbers")
Dataset imported from https://www.r-project.org.