Sunspot Numbers

• Solanki, S.K., I.G. Usoskin, B. Kromer, M. Schüssler and J. Beer. 2004. An unusually active Sun during recent decades compared to the previous 11,000 years. Nature, Vol. 431, No. 7012, pp.1084-1087, 28 October 2004.
IGBP/PAGES. Data Contribution Series #2005-015.

Index