sunspot: Yearly Sunspot Data, 1700-1988.
Monthly Sunspot Data, 1749-1997.
Description
Monthly and yearly number of sunspots.format
The univariate time series sunspot.year and
sunspot.month contain 289 and 2988 observations, respectively.
The object is of class "ts".source
Monthly data: SUNSPOT INDEX DATA CENTER, WORLD DATA CENTER-C1 FOR SUNSPOT INDEX
ROYAL OBSERVATORY OF BELGIUM, Av. Circulaire, 3 - B-1180 BRUSSELS
http://www.oma.be/KSB-ORB/SIDC/sidc_txt.html Yearly data: H. Tong (1996): Non-Linear Time Series. Clarendon Press Oxford,
Oxford, p. 471.