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Proceedings Paper

LASCO spectrometric Lyot coronagraph tunable passband filter
Author(s): Dennis George Socker; Guenter E. Brueckner; Clarence M. Korendyke; D. N. Lilley; James Henry Steenson; Preston Mitchell Kohn; Gail Marie Lyons; Michael Lawrence Owens; Norman E. Moulton; Robert W. Moye II; Rainer Schwenn; P. Hemmerich
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Paper Abstract

Spectrometric and spectropolarimetric aspects of the Lyot coronagraph flown aboard the ESA/NASA SOlar Heliospheric Observatory (SOHO) are presented. The coronagraph is one of the three channels comprising the LASCO coronagraph and the only channel with spectroradiometric capabilities. Among the primary science objectives assigned to the Lyot coronagraph are the determination of the mechanisms responsible for the acceleration of the solar wind and the heating of the corona. Spectrometric and spectropolarimetric coronal observations made with the Lyot coronagraph are used in support of these and other objectives. We describe the Lyot instrument design from the imaging coronal spectrometer perspective. The rationale for use of a tunable Fabry-Perot interferometer as the spectral resolving element is outlined. The relationships between spectral resolving power, interferometer diameter, telescope entrance stop diameter and coronal field of view as it applies to LASCO is reviewed. Performance requirements imposed on the interferometer by the coronal source and the science objectives are described. The optical, mechanical, electronic and semi-automated control designs as well as the interferometer modes of operation are summarized. The actual flight model Fabry-Perot interferometer performance allows the instrument to operate with high luminosity and with finesse values high enough to provide approximately optimal passband widths and reasonable tunable ranges about useful spectral features. We conclude with some early results indicative of the flight performance of the instrument.

Paper Details

Date Published: 25 November 1996
PDF: 15 pages
Proc. SPIE 2804, Missions to the Sun, (25 November 1996); doi: 10.1117/12.259711
Show Author Affiliations
Dennis George Socker, Naval Research Lab. (United States)
Guenter E. Brueckner, Naval Research Lab. (United States)
Clarence M. Korendyke, Naval Research Lab. (United States)
D. N. Lilley, Naval Research Lab. (United States)
James Henry Steenson, Lockheed Martin Missiles & Space Co., Inc. (United States)
Preston Mitchell Kohn, Lockheed Martin Missiles & Space Co., Inc. (United States)
Gail Marie Lyons, Lockheed Martin Missiles & Space Co., Inc. (United States)
Michael Lawrence Owens, Lockheed Martin Missiles & Space Co., Inc. (United States)
Norman E. Moulton, Allied Signal Technical Services Corp. (United States)
Robert W. Moye II, Artep, Inc. (United States)
Rainer Schwenn, Max-Planck-Institut fuer Aeronomie (Germany)
P. Hemmerich, Max-Planck-Institut fuer Aeronomie (Germany)

Published in SPIE Proceedings Vol. 2804:
Missions to the Sun
David M. Rust, Editor(s)

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