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Proceedings Paper

Cornelis Zwaan, open principle, and the future of high-resolution solar telescopes
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Paper Abstract

It was in the years around 1970 that during site-test campaigns for JOSO masts were erected up till 30 m height with sensors at several heights for the measurement of temperature fluctuations. Cornelis (Kees) Zwaan discovered that the fluctuations decrease drastically at heights from about 15 m and upward when there is some wind. The conclusion from this experience was the open telescope principle: the telescope should be completely free in the air 15 m or more above the ground. The Dutch Open Telescope (DOT) was the pioneering demonstrator of the open-telescope technology. Now that larger high-resolution telescopes come in view, it is time to analyze again the principle: (i) the essentials for proper working of the open principle; (ii) the differences with nighttime observations particularly concerning the seeing; (iii) the design consequences for the new generation of high-resolution solar telescopes.

Paper Details

Date Published: 10 July 2008
PDF: 12 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70120M (10 July 2008); doi: 10.1117/12.789944
Show Author Affiliations
Robert H. Hammerschlag, Astronomical Institute, Utrecht Univ. (Netherlands)
Felix C. M. Bettonvil, Astronomical Institute, Utrecht Univ. (Netherlands)
Aswin P. L. Jägers, Astronomical Institute, Utrecht Univ. (Netherlands)
Technology Foundation STW, Utrecht (Netherlands)
Guus Sliepen, Astronomical Institute, Utrecht Univ. (Netherlands)
Technology Foundation STW, Utrecht (Netherlands)

Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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