Optical design of a stigmatic spectroheliometer for photometric studies of dynamic phenomena at extreme-ultraviolet wavelengths

Details Optical design of a stigmatic spectroheliometer for photometric studies of dynamic phenomena at extreme-ultraviolet wavelengths Optical design of a stigmatic spectroheliometer for photometric studies of dynamic phenomena at extreme-ultraviolet wavelengths

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ssi.....3..389h&link_type=abstract

Space Science Instrumentation, vol. 3, Dec. 1977, p. 389-406.

Astronomy and Astrophysics

Astronomy

1

Far Ultraviolet Radiation, Heliometers, Solar Spectrometers, Spaceborne Astronomy, Stigmatism, Photometers, Ray Tracing, Reflecting Telescopes, Solar Activity, Solar Atmosphere, Spectroheliographs

Scientific paper

The design of a stigmatic spectroheliometer for photometric studies of dynamic phenomena in the solar atmosphere at extreme ultraviolet (EUV) wavelengths is described. The normal-incidence spectrometer requires only one reflective surface, and is equipped with a series of exit slits and associated one-dimensional detector arrays that are mounted at the secondary (vertical) foci of the concave diffraction grating. It is shown that such a spectrometer mounted at the focus of an off-axis paraboloid telescope mirror of the size employed in the EUV spectroheliometer flown on Skylab could record monochromatic images of a 2 x 2 (arcmin) sq field-of-view with a spatial resolution element of 1 x 1 (arcsec) sq in a time of 4 s, 24 s, or 4 min, depending on whether the region studied is flaring, active, or quiet. The resulting spectroheliograms would have an average photometric precision of 10% and a spectral purity of 0.1 A.

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