Abstract

The High Altitude Observatory has completed installation at its Climax, Colorado, station of a coronagraph-spectrograph system especially designed for versatility in solar observations. The Lyot-type coronagraph is an f/20 refractor of 40.6-cm aperture, with a simple objective achromatized by a Mangin mirror on the principle originated by Schupmann. The equivalent focal length is 10.8 m. The Coudé spectrograph is a stigmatic over-and-under f/26 reflecting system of 3.05-m focal length, with the grating at approximately the centers of curvature of the collimator and camera mirrors. Outputs are provided for a 50-cm by 35-mm film camera and two narrow-range auxiliary instruments in single pass, and for a magnetograph or other accessory in double-pass operation.

© 1964 Optical Society of America

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