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

Measurement of stray radiance in the High Altitude Observatory’s Skylab coronagraph

A. Csoeke-Poeckh, R. M. MacQueen, and A. I. Poland
Appl. Opt. 16(4) 931-937 (1977)

The McMath Solar Telescope of Kitt Peak National Observatory

A. Keith Pierce
Appl. Opt. 3(12) 1337-1346 (1964)

A Catadioptric Coronagraph Design

R. R. Fisher
Appl. Opt. 9(5) 1131-1136 (1970)

Radiance calibration of the High Altitude Observatory white-light coronagraph on Skylab

A. I. Poland, J. T. Gosling, R. M. MacQueen, and R. H. Munro
Appl. Opt. 16(4) 926-930 (1977)

The Solar Magnetograph of the High Altitude Observatory

R. H. Lee, D. M. Rust, and H. Zirin
Appl. Opt. 4(9) 1081-1084 (1965)