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Proceedings Paper

Ultrahigh resolution XUV spectroheliograph
Author(s): Arthur B. C. Walker; Joakim F. Lindblom; J. Gethyn Timothy; Troy W. Barbee; Richard B. Hoover; Einar Tandberg-Hanssen
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Paper Abstract

We describe a space borne solar observatory, the Ultra High Resolution XUV Spectroheliograph (UHRXS), which has been selected by NASA for flight among the initial scientific instruments to be placed on the space station "Freedom". The principal URRXS instruments are nine XUV multilayer Ritchey-Chretien Telescopes covering the spectral range from -70 to -350 A; each telescope is able to isolate line multiplets within a narrow wavelength interval which are excited over a narrow temperature range, providing full disk images of diagnostic quality covering structures in the solar atmosphere ranging in temperature from T .5O,OOO K (He II ). 304 A) to 20,000,000 K (Fe XXIV X 192 A). The XUV images will be recorded on high resolution 70 mm format film, allowing resolutions as high as 0. 1 arc second to be achieved for a 1.O field. The XUV images will be supplemented by; (i) full disk high resolution (O.1") far ultraviolet images in H I Ly a ( 1216 A) and C IV (X 1548/1550 A), (ii) full disk soft x-ray images in 4 bands in the interval ?X 6 -70 A and (iii) electronically recorded high resolution (;v&% >10,000) spectroheliograms in 2 XUV, 1 EUV (.'45O A to 1 100 A) and 2 FUV (-4 100 A to 1600 A) bands. The electronically recorded images will use the Multi-Anode Multi-Channel Array (MAMA) detector. We propose to utilize the resulting data sets to address fundamental problems related to the following solar phenomena: (i) the fine structure of the solar chromosphere/corona interface, (ii) the structure, energetics and evolution of high temperature coronal loops, (iii) the large scale structure and dynamics of the corona, including the solar wind interface, the magnetic filed, and coronal mass ejections, and (iv) solar flares, especially the pre-flare state, the impulsive release of energy, and the evolution of post-flare loops. Subject Terms: solar atmosphere, corona, soft x-ray (XUV), extreme ultraviolet (EUV), far ultraviolet (FUV), multilayer optics

Paper Details

Date Published: 1 July 1990
PDF: 16 pages
Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); doi: 10.1117/12.19148
Show Author Affiliations
Arthur B. C. Walker, Stanford Univ. (United States)
Joakim F. Lindblom, Stanford Univ. (United States)
J. Gethyn Timothy, Stanford Univ. (United States)
Troy W. Barbee, Lawrence Livermore National Lab. (United States)
Richard B. Hoover, NASA/Marshall Space Flight Ctr. (United States)
Einar Tandberg-Hanssen, NASA/Marshall Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 1235:
Instrumentation in Astronomy VII
David L. Crawford, Editor(s)

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