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Proceedings Paper

Active sun telescope array
Author(s): Arthur B. C. Walker II; J. Gethyn Timothy; Troy W. Barbee Jr.; Richard B. Hoover
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Paper Abstract

As part of the planning process for the Orbiting Solar Laboratory (OSL), a proposed NASA space-borne solar observatory, the authors have developed an instrument concept, the "Active Sun Telescope Array" (ASTA), for a high resolution soft x-ray/Extreme Ultraviolet (XUV) experiment designed to investigate the phenomenology of the solar chromosphere and corona. ASTA is an ensemble of six EUV/XUV solar telescopes designed to provide: (i) wide field (i.e. full disk) solar images in narrow wavelength bands, (ii) high resolution spectroheliograms, and (iii) line profiles, of the solar plasma in the temperature range from 10,000 K to 30,000,000 K. The ASTA also incorporates specific operational modes to allow the precise registration of its EUV and XUV images and the visible/ultraviolet and far ultraviolet images of the other primary OSL instruments. The simplest (baseline) ASTA configuration incorporates six identical telescopes, which differ only in the reflective coatings used normal incidence multilayer coated optics are used for XUV observations, principally of the solar plasma from 900,000 K to 30,000,000 K, and SiC optics are used for extreme-ultraviolet observations of the solar plasma from 20,000 K to 2,000,000 K. An attractive option, which allows the ASTA to extend its coverage of the solar plasma to material as hot as 100,000,000 K, is the replacement of one or more of the XUV telescopes with Wolter I grazing incidence telescopes to allow soft x-ray observations down to -1.5 A. The detector used in the ASTA is the MAMA photon counting array detector.

Paper Details

Date Published: 1 February 1991
PDF: 14 pages
Proc. SPIE 1343, X-Ray/EUV Optics for Astronomy, Microscopy, Polarimetry, and Projection Lithography, (1 February 1991); doi: 10.1117/12.23206
Show Author Affiliations
Arthur B. C. Walker II, Stanford Univ. (United States)
J. Gethyn Timothy, Stanford Univ. (United States)
Troy W. Barbee Jr., Lawrence Livermore National Lab. (United States)
Richard B. Hoover, NASA/Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 1343:
X-Ray/EUV Optics for Astronomy, Microscopy, Polarimetry, and Projection Lithography

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