.
Full disc photospheric and Hα photographs were
taken from 1957 until 1991. Calcium II K full disc images were also
taken from 1958 to 1980 with a spectroheliograph
Töpfer and a refractor (f= 220 cm).
The archived images are available for interested scientists.
The (negative) originals can be consulted directly at the Specola in
Locarno Monti, on appointment. Tel: +41 91 756 23
76 or email at .