Location: Observatorio del Roque de los Muchachos, Spain
Owner: Institute for Solar Physics - Stockholm University
The Swedish 1-m Solar Telescope (SST) is operated by Stockholm University (Sweden) in the Observatorio del Roque de Los Muchachos, on the island of La Palma (Spain). The SST is a refractor telescope with a 1-m objective lens which also serves as entrance window to the vacuum system. The telescope tube is evacuated in order to avoid heated air which would be detrimental to the image quality.
When the SST started operations in 2002 it became the first solar telescope to reach a spatial resolution of 0.1 arcseconds (corresponding to 70 km on the Sun). This resolution allowed scientists to immediately discover new fine structures in sunspot penumbrae. Since then, the SST has been at the forefront of research with a growing suite of advanced spectropolarimetric instrumentation.