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\name{sunspot}
\alias{sunspot}
\alias{sunspot.month}
\alias{sunspot.year}
\title{
  Yearly Sunspot Data, 1700--1988.
  Monthly Sunspot Data, 1749--1997.
}
\usage{
data(sunspot)
}
\format{
  The univariate time series \code{sunspot.year} and
  \code{sunspot.month} contain 289 and 2988 observations, respectively.
  The objects are of class \code{"ts"}.
}
\description{
  Monthly and yearly number of sunspots. 
}
\seealso{
  \code{sunspot.month} is a longer version of \code{\link{sunspots}}
  in base \R, that runs until 1988.
}
\source{
  Monthly data: Sunspot Index Data Center,
  World Data Center-C1 For Sunspot Index
  Royal Observatory of Belgium, Av. Circulaire, 3, B-1180 BRUSSELS
  \url{http://www.oma.be/KSB-ORB/SIDC/sidc_txt.html}

  Yearly data: H. Tong (1996)
  \emph{Non-Linear Time Series}. Clarendon Press, Oxford, p. 471. 
}
\keyword{datasets}