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Proceedings Paper

GISOT: a giant solar telescope
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Paper Abstract

A concept is presented for an extremely large high-resolution solar telescope with an aperture of 11 m and diffraction limited for visual wavelengths. The structure of GISOT will be transparent to wind and placed on a transparent stiff tower. For efficient wind flushing, all optics, including the primary mirror, will be located above the elevation axis. The aperture will be of the order of 11 m, not rotatively symmetrical, but of an elongated shape with dimensions 11 x 4 m. It consists of a central on-axis 4 m mirror with on both sides 3 pieces of 2 m mirrors. The optical layout will be kept simple to guarantee quality and minimize stray light. A Coudé room for instruments is planned below the telescope. The telescope will not be housed in a dome-like construction, which interferes with the open principle. Instead the telescope will be protected by a foldable tent construction with a diameter of the order of 30 m, which doesn’t form any obstruction during observations, but can withstand the severe weather circumstances on mountain sites. Because of the nature of the solar scene, extremely high resolution in only one dimension is sufficient to solve many exciting problems in solar physics and in this respect the concept of GISOT is very promising.

Paper Details

Date Published: 28 September 2004
PDF: 16 pages
Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.550513
Show Author Affiliations
Robert H. Hammerschlag, Utrecht Univ. (Netherlands)
Oskar F.H. von der Luhe, Kiepenheuer-Institut fur Sonnenphysik (Germany)
Felix C.M. Bettonvil, Utrecht Univ. (Netherlands)
ASTRON (Netherlands)
Aswin P.L. Jagers, Utrecht Univ. (Netherlands)
Frans Snik, Utrecht Univ. (Netherlands)

Published in SPIE Proceedings Vol. 5489:
Ground-based Telescopes
Jacobus M. Oschmann Jr., Editor(s)

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