An EUV imaging spectrograph for high-resolution observations of the solar corona |
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| Authors: | Werner M Neupert Gabriel L Epstein Roger J Thomas William T Thompson |
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| Institution: | (1) Laboratory for Astronomy and Solar Physics, NASA /Goddard Space Flight Center, 20771 Greenbelt, MD, USA;(2) Present address: X-ray Timing Explorer Project Code 410, NASA/Goddard Space Flight Center, 20771 Greenbelt, MD, USA;(3) Applied Research Corporation, 20785 Landover, MD, USA |
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| Abstract: | An extreme ultraviolet (EUV) imaging spectrograph for the wavelength range from 235 to 450 Å has been developed and used for high resolution observations of the Sun. The instrument incorporates a glancing incidence Wolter Type II Telescope and a near-normal incidence toroidal grating spectrograph to achieve near-stigmatic performance over this spectral range. The design of the spectrograph entrance aperture enables both stigmatic spectra with spectral resolution adequate to observe emission line profiles and spectroheliograms of restricted portions of the Sun to be obtained concurrently. In this paper we describe the design and performance of the instrument and provide an overview of results obtained during a sounding rocket flight on May 5, 1989. |
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