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  • 1
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    Preliminary results on an H-alpha map of the Gum nebula obtained with the D-z-A satellite (1971)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Hydrogen emissions, including telluric H alpha, in the terrestrial atmosphere were studied. The H alpha experiment was designed to use a monochromatic photometer that would provide measurements of weak H alpha emission originating at altitudes of a few hundred or thousand km, free of contamination by other telluric emissions. The Gum nebula was recorded by the instrument as a much more intense feature than the geocoronal emission. The spacecraft employed and the optical onboard equipment are described. Field of view, spectral response, absolute calibration, linearity, and inflight performance are discussed.
    Keywords: SPACE SCIENCES
    Type: NASA. Goddard Space Flight Center The Gum Nebula and Related Probl.; p 220-228
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Resolution of the discrepancy between Balmer alpha emission rates, the solar Lyman beta flux, and models of geocoronal hydrogen concentration (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: New satellite Balmer alpha measurements and solar Lyman beta flux and line profile measurements, together with new measurements of the zodiacal light intensity used in correcting both ground and satellite Balmer alpha measurements for the effects of the Fraunhofer line in the zodiacal light, have been used in a reevaluation of the long-standing discrepancy between ground-based Balmer alpha emission rates and other geocoronal hydrogen parameters. The solar Lyman beta line center flux is found to be (4.1 plus or minus 1.3) billion photons per sq cm per sec per angstrom at S(10.7) equals 110 and, together with a current hydrogen model which has 92,000 atoms per cu cm at 650 km for T(inf) equals 950 K, gives good agreement between calculated Balmer alpha emission rates and the ground-based and satellite measurements.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 81; Nov. 1
    Format: text
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    NASA TECHNICAL REPORTS
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