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1 February 1991 Active sun telescope array
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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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Arthur B. C. Walker II, J. Gethyn Timothy, Troy W. Barbee Jr., and Richard B. Hoover "Active sun telescope array", Proc. SPIE 1343, X-Ray/EUV Optics for Astronomy, Microscopy, Polarimetry, and Projection Lithography, (1 February 1991);


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