An EUV imaging spectrograph for high-resolution observations of the solar corona

• Published in: Solar physics Vol. 137; no. 1; pp. 87 - 104
• Main Authors: Neupert, Werner M., Epstein, Gabriel L., Thomas, Roger J., Thompson, William T.
• Format: Journal Article
• Language: English
• Published: Legacy CDMS Reidel 01.01.1992
• Subjects: Astronomical and space-research instrumentation; Astronomy; Earth, ocean, space; Exact sciences and technology; Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations; Solar Physics; Design; Solar corona; Coronal line; Instruments; On board apparatus; Emission line; Performance; Spectrometer; Ultraviolet spectrometry; Rocket observation; Vacuum ultraviolet spectrum
• ISSN: 0038-0938; 1573-093X
• DOI: 10.1007/bf00146577

An extreme ultraviolet (EUV) imaging spectrograph for the wavelength range from 235 to 450 A has been developed and used for 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. The design and performance of the instrument are described, and an overview of results obtained during a sounding rocket flight on May 5, 1989 is provided.