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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 Observatory.
monthMonth of the observation.
sunspotsNumber of observed sunspots.
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.
t = octave.dataset.sunspots;
figure
plot (datenum (t.month), t.sunspots)
datetick ("x")
xlabel ("Date")
ylabel ("Monthly sunspot numbers")
title ("sunspots data")