Catalogs of solar observations of Meudon and Haute Provence Hα heliographs (1954-2004) and their instrumental capabilities

Hα heliographs are imaging instruments designed to produce monochromatic images of the solar chromosphere at fast cadence (60 s or less). They are designed to monitor the dynamic phenomena of solar activity, such as flares or material ejections. Meudon and Haute Provence observatories started systematic observations in the frame of the International Geophysical Year (IGY 1957) with Lyot filters. This technology evolved several times until 1985 with tunable filters allowing to observe alternatively the line wings and core (variable wavelength). More than 6 million images were produced during 50 years, mostly on 35 mm films Catalogs of observations are available with this paper and data (off line) can be requested. We present the capabilities of the successive versions of the Hα instruments in operation between 1954 and 2004, and describe briefly the new heliograph (MeteoSpace) which operates since January 2024 at Calern Observatory.