12-month forecasts of the monthly sunspot number
Optimization of base predictions using a Kalman filter
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For any scientific use please refer to this paper
Data Credits: The Sunspot Number data can be freely downloaded. However, we request that proper credit to the WDC-SILSO is explicitely included in any publication using our data (paper article or book, on-line Web content, etc.), e.g.: "Source: WDC-SILSO, Royal Observatory of Belgium, Brussels".
For additonal information, contact Laure Lefèvre (E_mail: email@example.com )
Royal Observatory of Belgium Av. Circulaire, 3 - B-1180 Brussels, Belgium