Apollo-Soyuz survey of the extreme-ultraviolet/soft X-ray background

Details Apollo-Soyuz survey of the extreme-ultraviolet/soft X-ray background Apollo-Soyuz survey of the extreme-ultraviolet/soft X-ray background

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..755s&link_type=abstract

Astrophysical Journal, Part 1, vol. 230, June 15, 1979, p. 755-767.

Astronomy and Astrophysics

Astrophysics

36

Apollo Soyuz Test Project, Background Radiation, Far Ultraviolet Radiation, X Rays, Astronomical Models, Diffuse Radiation, Interstellar Gas, X Ray Sources

Scientific paper

The paper reports results of the most extensive survey to date of the EUV/soft X-ray background, obtained with an EUV telescope on the Apollo-Soyuz mission. The principal results may be summarized as follows: (1) an intense background flux exists down to energies of 100 eV (4.0 plus or minus 1.3 photons/sq cm/sec/sr/eV average diffuse flux); (2) the Apollo-Soyuz data alone places lower and upper limits on single-temperature models for EUV-emitting interstellar gas for the log T range of 5.1-6.0; and (3) the allowed range would have to be restricted to log T of 5.1-5.6 for the Cash, Malina, and Stern (1976), Burstein et al. (1977), and Apollo-Soyuz data sets to satisfy a single-temperature model for the background at not greater than 280 eV.

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