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World Data Center for the production, preservation and dissemination of the international sunspot number


Sunspot number series: latest update

The Locarno station just completed a 5 year digitization project

The Specola Solare Ticinese, which is the pilot station of the SILSO network, completed a 5 years project for the digitization and safe archiving of the sunspot observations and data collected at the Specola Solare Ticinese in Locarno :
In addition, SST and IRSOL ( also developed an interactive WEB interface to look at these
Supported by :