Data

A revised collection of sunspot group numbers

 

Data, list of observers, and differences between this revised collection and the data provided by Hoyt and Schatten (1998).

 

  Sunspot Number (General)

 

International Sunspot Number from WDC-SILSO, Royal Observatory of Belgium, Brussels

Sunspot Numbers from National Geophysical Data Center

 

Sunspot Number (by observers)

 

Sunspot counting by D. E. Hadden from 1890 to 1931 (annual)

Sunspot counting by D. E. Hadden from 1890 to 1902 (daily)

Sunspot Numbers and Areas from the Madrid Astronomical Observatory (1876-1986) (monthly)

Sunspot Numbers and Areas from the Madrid Astronomical Observatory (1876-1986) (daily)

 

Sunspot Positions and Catalogues

 

Position of Sunspots observed by Galileo (1612) (txt)

Sunspot Catalogue of the Valencia Observatory (1920-1928) (txt)

Latitude of Sunspots during the Maunder Minimum (txt)