Photografic archive of solar images

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 images have been stored in 2020 at the ETH Zurich University Archives.

Image list:

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