ISIS Fourier telescope concept for imaging the sun and the sky in hard x rays and gamma rays

Jonathan W. Campbell; Melody C. Herrmann; Greg Hajos; Susan Spencer; Reggie Alexander; Henry B. Waites; Howard D. Hall; Jonathon M. Fields; Charles R. Taylor

doi:10.1117/12.218398

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1 September 1995 ISIS Fourier telescope concept for imaging the sun and the sky in hard x rays and gamma rays

Jonathan W. Campbell, Melody C. Herrmann, Greg Hajos, Susan Spencer, Reggie Alexander, Henry B. Waites, Howard D. Hall, Jonathon M. Fields, Charles R. Taylor

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Proceedings Volume 2518, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI; (1995) https://doi.org/10.1117/12.218398
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The Marshall Space Flight Center, Alabama in a teaming arrangement with the Naval Research Laboratory, Maryland has developed the ISIS (impulsive solar imaging spectrometer) mission for viewing the sun and the sky in the EUV, soft, and hard x rays. The soft and hard x ray imaging as well as the gamma-ray spectroscopy will be provided by a three axis pointed Fourier telescope (i.e. a spatial modulation collimator). The EUV imager will be a supporting context instrument. This paper describes the optimized instrument concept and discusses the associated trades made in developing it. For example, the numbers of spatial frequencies measured versus the sensitivity needed for imaging weak sources is discussed in detail. ISIS builds upon the YOHKOH findings in that the telescope is tailored to image compact simple loop sources. Only two spatial frequencies need be measured, allowing substantial gains in sensitivity. In addition, this allows both the real and imaginary Fourier components to be measured, which is a vast improvement over approaches that measure only the real components.

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Jonathan W. Campbell, Melody C. Herrmann, Greg Hajos, Susan Spencer, Reggie Alexander, Henry B. Waites, Howard D. Hall, Jonathon M. Fields, and Charles R. Taylor "ISIS Fourier telescope concept for imaging the sun and the sky in hard x rays and gamma rays", Proc. SPIE 2518, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI, (1 September 1995); https://doi.org/10.1117/12.218398

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