Data

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 and Areas (by observers)

Sunspot and prominence counting by E. H. Strach from 1969 to 2008 (daily)

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)

Group number from Malapert’s sunspot records (1618-1626) (daily)

Sunspot counting from the sunspot observations recorded by Hevelius in Selenographia (1642-1645) (daily)

Sunspot Observations by Barnaba Oriani (1778 – 1779) (daily)

Group counting from Bond’s sunspot drawings (1847 – 1849) (daily)

Sunspot records by Antonio Colla at the end of the Dalton Minimum (1830 – 1843) (daily)

Number of Sunspot Groups from the Galileo-Scheiner controversy revisited (daily)

A Reanalysis of the Number of Sunspot Groups Recorded by Pierre Gassendi in the previous cycle to the Maunder Minimum (daily)

Revisiting Christoph Scheiner’s Sunspot Records: a New Perspective on Solar Activity of the Early Telescopic Era (daily)

Analyses of Early Sunspot Records by Jean Tarde (1615–1617) and Jan Smogulecki (1621–1625) (daily)

Sunspot area from the Stonyhurst College Observatory (1886 – 1940) (csv)

Number of sunspot groups and individual sunspots recorded by Tevel for the period 1816–1836 in the Dalton Minimum (daily)

A note on the sunspot and prominence records made by Angelo Secchi during the period 1871–1875 (xlsx)

                                                   

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)

Sunspot positions from Selenographia by Hevelius (1642-1645) (txt)

Sunspot positions calculated from «Austriaca Sidera» by Charles Malapert (txt)

Heliographic coordinates by Barnaba Oriani (1778 – 1779) (txt)

Sunspot catalogue from the National Solar Observatory at Sacramento Peak (1947 – 2004) (csv)

Analyses of Early Sunspot Records by Jean Tarde (1615–1617) and Jan Smogulecki (1621–1625) (txt)

Sunspot catalogue from the Stonyhurst College Observatory (1921 – 1935) (csv)