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

Robert H. Hammerschlag; Felix C. M. Bettonvil; Aswin P. L. Jägers; Guus Sliepen

doi:10.1117/12.789944

10 July 2008 Cornelis Zwaan, open principle, and the future of high-resolution solar telescopes

Robert H. Hammerschlag, Felix C. M. Bettonvil, Aswin P. L. Jägers, Guus Sliepen

Proceedings Volume 7012, Ground-based and Airborne Telescopes II; 70120M (2008) https://doi.org/10.1117/12.789944
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

Robert H. Hammerschlag, Felix C. M. Bettonvil, Aswin P. L. Jägers, and 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); https://doi.org/10.1117/12.789944

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available