Monthly Sunspot Numbers, 1749–1983

Description

Monthly mean relative sunspot numbers from 1749 to 1983. Collected at Swiss Federal Observatory, Zurich until 1960, then Tokyo Astronomical Observatory.

Usage

sunspots

Format

A time series of monthly data from 1749 to 1983.

Source

⁠Andrews D. F., Herzberg A. M. (1985). Data: A Collection of Problems from Many Fields for the Student and Research Worker. Springer, New York, NY. ISBN 9781461250982. doi:10.1007/978-1-4612-5098-2.

See Also

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.

Examples

require(graphics)
plot(sunspots, main = "sunspots data", xlab = "Year",
     ylab = "Monthly sunspot numbers")