Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..808s&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Feb. 1, 1979, p. 808-815.
Astronomy and Astrophysics
Astronomy
27
Diffuse Radiation, Far Ultraviolet Radiation, Interstellar Radiation, Spaceborne Astronomy, Ultraviolet Spectroscopy, Abundance, Astronomical Spectroscopy, Cosmic Rays, Spectral Line Width, Thermal Noise, Voyager Project
Scientific paper
Results are reported for observations and a preliminary theoretical analysis of the diffuse interstellar EUV radiation field exhibiting positive measurable fluxes in the wavelength range from 912 to 1150 A. The observations were made with the UV spectrometers on the two Voyager spacecraft, and a spectral half-width of 30 A was obtained. The procedures used in the analysis are described in detail, particularly those relating to the elimination of thermal and cosmic-ray noise, internal instrumental scattering from bright lines, and possible contributions from direct starlight. Measurements in several directions reveal diffuse intensities at 975 A ranging from a maximum of about 10 to the -7th erg/sq cm per (sec sr A) near the galactic plane to an upper limit of 10 to the -8th erg/sq cm per (sec sr A). A comparison of the present measurements with various theoretical predictions and previous measurements indicates reasonable agreement with some theoretical predictions of the interstellar EUV intensity.
Broadfoot Lyle A.
Sandel Bill R.
Shemansky Don E.
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