Quarterly mean relative sunspots number from 1749-1983

quarterly_sunspots

Format

A data frame with 940 rows and 4 variables

year
qu: quarter
spots: total number of sunspots
mean_spots_per_year

Source

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.