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  • Other Sources  (4)
  • 2000-2004
  • 1975-1979  (4)
  • 1935-1939
  • 1977  (4)
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  • 2000-2004
  • 1975-1979  (4)
  • 1935-1939
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  • 1
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    Cosmic diffuse gamma rays from 2 to 25 MeV (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are reported for measurements of cosmic diffuse gamma rays performed with a double Compton scatter gamma-ray telescope flows aboard a balloon at 3.5-g/sq cm residual atmosphere. The operation and calibration of the telescope are briefly reviewed, unwanted backgrounds are identified, and the only significant background for the telescope used is shown to arise from the interaction of albedo neutrons with hydrogen and carbon in one of the liquid scintillators. The fluxes of cosmic diffuse gamma rays with energies of 2 to 3, 3 to 5, 5 to 7, 7.5 to 10 MeV are listed, and upper limits are provided for energies of 10 to 15 and 15 to 25 MeV. These data are compared with numerous previous measurements, and no indication is found that the diffuse radiation is statistically different from isotropic. Upper limits are placed on the gamma-ray fluxes (mainly 3 to 25 MeV) from various localized sources.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; vol. 218
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Meteorological results from the surface of Mars - Viking 1 and 2 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The meteorology equipment carried by the Viking landers was intended to measure atmospheric temperature, wind speed, wind direction, and pressure. During the summer months, the winds were a few meters per second, with a complex hodograph and the Lander-1 site, dominated by counterclockwise turning of the wind, and a simpler hodograph at the Lander-2 site, marked by clockwise turning of the wind. With advancing season, the repetitive wind pattern began to break down, and protracted northeasterly winds were recorded on several occasions (some of which are associated with lower than normal temperatures). Examples are given of wind and temperature traces over short periods, illustrating the effects of convection, static stability, and lander interference. A theoretical argument, based on the horizontal scale dictated by heating of slopes and on vertical mixing of momentum, is presented to explain the different sense of wind rotation at the two lander sites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 82; Sept. 30
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Atmospheric gamma ray angle and energy distributions from 2 to 25 MeV (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are given for gamma ray fluxes in six energy intervals from 2-25 MeV and five zenith angle intervals from 0-50 deg (downward moving) and five from 130-180 deg (upward moving). Observations were obtained with the University of California, Riverside double Compton scatter gamma ray telescope flown on a balloon to a 3.0 g/sq cm residual atmosphere at a geomagnetic cuttoff of 4.5 GV. It was found that the angular distribution of downward moving gamma rays is relatively flat, increasing slowly from 10-40 deg. The angular distribution of the upward moving gamma rays at 4.2 g/sq cm increases with angle from the vertical. Energy distributions of upward and downward moving gamma rays are in good agreement with the results of previous studies.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; Sept. 1
    Format: text
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  • 4
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    Precision surveying using very long baseline interferometry (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Radio interferometry measurements were used to measure the vector baselines between large microwave radio antennas. A 1.24 km baseline in Massachusetts between the 36 meter Haystack Observatory antenna and the 18 meter Westford antenna of Lincoln Laboratory was measured with 5 mm repeatability in 12 separate experiments. Preliminary results from measurements of the 3,928 km baseline between the Haystack antenna and the 40 meter antenna at the Owens Valley Radio Observatory in California are presented.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-X-71405 , X-922-77-242 , Ann. Meeting of the Am. Soc. of Civil Engr.; Oct 17, 1977 - Oct 21, 1977; San Francisco
    Format: application/pdf
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