Orbiting solar telescope on 'Salyut-4' station

Astronomy and Astrophysics – Astronomy

Scientific paper

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Salyut Space Station, Solar Flares, Spaceborne Astronomy, Spaceborne Telescopes, Spectrophotography, Far Ultraviolet Radiation, Fine Structure, Optical Equipment, Optical Materials, Photographic Recording, Solar Atmosphere, Solar Prominences, Spectral Resolution, Sunspots

Scientific paper

Technical characteristics of the high spectral and spatial resolution solar telescope (F = 2.5 m, d = 250 mm) mounted on board Salyut-4 are described. The cosmonaut-operated telescope produces the solar image on the entrance slit of a stigmatic two-grating spectrograph with a spectral resolution of 0.3 A and a dispersion of 16 A/mm. An automatic system keeps the observed solar features on the spectrograph slit with an accuracy of 3-4 arcsec. The paper covers the optical scheme of the telescope, its shadow-type solar sensors, and the coatings of the telescope optics. The guiding mirror is coated with Al + LiF (and a thin layer of MgF2), while Ge + ZnS coatings are used for the main mirror and the gratings. A device for refreshing the mirror coatings was designed and used during the flight. Information is given on observational data concerning solar flares, flocculi, prominences, sunspots and quiet regions of the solar atmosphere, obtained with the aid of the Salyut-4 solar telescope.

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