Physics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phdt.........3a&link_type=abstract
Ph.D. Thesis Johns Hopkins Univ., Baltimore, MD.
Physics
6
Extraterrestrial Radiation, Interstellar Matter, Light (Visible Radiation), Absorption Spectra, Cosmic Rays, Deuterium, Satellite Observation, Ultraviolet Spectrometers
Scientific paper
Analyses of two experimental programs designed to estimate the density of the universe are reported. First, the Copernicus satellite was used to observe hydrogen and deuterium absorption in local interstellar matter. Secondly, two far ultraviolet spectrometers were used to study galactic plane light scattered off interstellar dust, in order to measure the scattering properties of the dust, and also to detect cosmic background radiation. The interstellar absorption spectra were obtained using bright, close stars as light sources. The density and temperature of interstellar hydrogen and deuterium along the line of sight to each target star were obtained by fitting appropriate models to the data. A set of acceptable densities and temperatures is presented for each star.
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