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Proceedings Paper

The feasibility of large refracting telescopes for solar coronal research
Author(s): Peter G. Nelson; Steven Tomczyk; David F. Elmore; Donald J. Kolinski
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Paper Abstract

Measuring magnetic fields in the solar corona requires a large aperture telescope with exceptionally low levels of scattered light. For internally-occulted coronagraphs the main source is scattering from dust or microroughness on the primary lens or mirror. We show refracting primaries offer significantly lower levels for both sources. To observe magnetic fields in the solar corona with scientifically interesting spatial and temporal resolutions, a 1 meter aperture or larger is required. For a long time such large-scale refractors have been deemed impractical or impossible to construct due to gravitational deformation of the lens. We present the results of finite-element and optical analyses of the gravitational deformation, stress-induced birefringence, and absorptive heating of a (see manuscript)1.5 meter f/5 fused silica lens. These studies demonstrate the traditional objections to large refractors are unfounded and large refracting primaries have unique capabilities.

Paper Details

Date Published: 10 July 2008
PDF: 12 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 701231 (10 July 2008); doi: 10.1117/12.789494
Show Author Affiliations
Peter G. Nelson, High Altitude Observatory (United States)
Steven Tomczyk, High Altitude Observatory (United States)
David F. Elmore, High Altitude Observatory (United States)
Donald J. Kolinski, High Altitude Observatory (United States)

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

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