Abstract

A combination solar spectroheliograph and spectrograph, newly installed in the Philippines at 8-h East longitude is described. The rotatable vacuum spectrograph follows an Ebert design, consisting of a plane grating and two mirrors. These off-axis mirrors are figured sections of one single mirror form and function as collimating and camera mirrors. The spectrograph system matches the f/24 Gregorian-type telescopic quartz mirror system of 30.5-cm clear aperture, fed by 41-cm coelostat mirrors. The grating drive is wholly within the tank. Spectroheliograph scans are with fixed slits but with a moving image and moving plate or filmholder. Slit jaws are of stainless steel and form slits 76 mm long. Dispersion is 2.75 Å/mm in the first order. An 8.3-cm × 10.8-cm plateholder receives the spectrogram or spectroheliogram image. Visual monitoring and 35-mm photographs of the solar image at the entrance slit are made through an Ha Halle monochromator. A typical spectrogram and spectroheliogram are shown.

© 1965 Optical Society of America

The McMath Solar Telescope of Kitt Peak National Observatory

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Appl. Opt. 3(12) 1337-1346 (1964)

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The Solar Magnetograph of the High Altitude Observatory

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