Monthly Mean Relative Sunspot Numbers
Usage
data(sunspots)
Format
A time series of 229 cases (years from 1749 to 1983) on 12
variables (the mean relative sunspot numbers in the months January
to December). The last case is incomplete.Description
Zurich monthly sunspot numbers from 1749 to 1983.Source
D. F. Andrews and A. M. Herzberg (1985).
Data: A Collection of Problems from Many Fields for the
Student and Research Worker.
New York: Springer-Verlag.