10 July 2008 Cornelis Zwaan, open principle, and the future of high-resolution solar telescopes
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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.
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Robert H. Hammerschlag, Robert H. Hammerschlag, Felix C. M. Bettonvil, Felix C. M. Bettonvil, Aswin P. L. Jägers, Aswin P. L. Jägers, Guus Sliepen, Guus Sliepen, } "Cornelis Zwaan, open principle, and the future of high-resolution solar telescopes", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70120M (10 July 2008); doi: 10.1117/12.789944; https://doi.org/10.1117/12.789944
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