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  • GEOPHYSICS  (1)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • 1980-1984  (1)
  • 1975-1979  (1)
Collection
Keywords
Years
Year
  • 1
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    Unknown
    First estimate of annual mercury flux at the Kilauea main vent (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Mercury and sulphur dioxide analyses were conducted from 1971 to 1980 on air samples collected immediately downwind of Halemaumau, the Kilauea main vent, in Hawaii. On the basis of these measurements, an Hg/SO2 ratio of 0.00051 has been derived which, when applied to the recently determined SO2 mass output of Halemaumau, yields a calculated Hg flux of 2.6 x 10 to the 8th g annually. This rate is consistent with Varekamp and Busek's (1981) evidence suggesting that volcanogenic Hg significantly contributes to the atmospheric total.
    Keywords: GEOPHYSICS
    Type: Nature (ISSN 0028-0836); 309; 146
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Attitude determination techniques for Nimbus 6 and Nimbus G (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Techniques for measuring attitude deviations in the Nimbus 6 and Nimbus G 3-axis stabilized, zero-momentum, earth observation satellites are presented. The on-orbit telemetered data include scanner roll and pitch error signals, an illuminated DSAS which can read the azimuth and elevation of the sunline when the spacecraft is not in the umbra, the signal from the single gyro in the RMP, and the momenta of the reaction wheels. Mathematical methods for interpreting the measured data are described with attention to filter equations, especially the Kalman filter because of its ability to eliminate high frequency noise.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Astrodynamics Specialist Conference; Sept. 7-9, 1977; Jackson Hole, WY; US
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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