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The soft x ray telescope for Solar-AThe Solar-A satellite being prepared by the Institute for Sapce and Astronautical Sciences (ISAS) in Japan is dedicated to high energy observations of solar flares. The Soft X Ray Telescope (SXT) is being prepared to provide filtered images in the 2 to 60 A interval. The flight model is now undergoing tests in the 1000 foot tunnel at MSFC. Launch will be in September 1991. Earlier resolution and efficiency tests on the grazing incidence mirror have established its performance in soft x rays. The one-piece, two mirror grazing incidence telescope is supported in a strain free mount separated from the focal plane assembly by a carbon-epoxy metering tube whose windings and filler are chosen to minimize thermal and hygroscopic effects. The CCD detector images both the x ray and the concentric visible light aspect telescope. Optical filters provide images at 4308 and 4700 A. The SXT will be capable of producing over 8000 of the smallest partial frame images per day, or fewer but larger images, up to 1024 x 1024 pixel images. Image sequence with two or more of the five x ray analysis filters, with automatic exposure compensation to optimize the charge collection by the CCD detector, will be used to provide plasma diagnostics. Calculations using a differential emission measure code were used to optimize filter selection over the range of emission measure variations and to avoid redundancy, but the filters were chosen primarily to give ratios that are monotonic in plasma temperature.
Document ID
19900003159
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Brown, W. A. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Acton, L. W. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Bruner, M. E. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Lemen, J. R. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Strong, K. T. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1989
Publication Information
Publication: NASA, Goddard Space Flight Center, Max '91 Workshop 2: Developments in Observations and Theory for Solar Cycle 22
Subject Category
Solar Physics
Accession Number
90N12475
Funding Number(s)
CONTRACT_GRANT: NAS8-37334
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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