Monthly Mean Relative Sunspot Numbers
Usage
data(sunspots)
Format
A time series of monthly data from 1749 to 1983.Description
Monthly sunspot numbers from 1749 to 1983. Collected at Swiss
Federal Observatory, Zurich until 1960, then Tokyo Astronomical
Observatory.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.