Skip to main content

Locarno Specola Solare Ticinese

The Specola Solare Ticinese (SST : is the pilot station of the SILSO network. It  has digitized and archived  the sunspot observations and data collected at the Specola Solare Ticinese station in Locarno. This was done in a 5 year project financially supported by the Federal Office of Meteorology and Climatology MeteoSwiss, in the framework of GCOS Switzerland ( and in collaboration with ETH-Zurich University Archives (  
An important result of this project is the recent publication on ZENODO of the sunspot group database that you can find at the following link:
In addition, SST and IRSOL ( also developed an interactive WEB interface to look at these data