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  • 1
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    Direct evidence of transport processes in the thermospheric diurnal tide (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Measurements of neutral composition and temperature obtained between December 6, 1975, and September 17, 1976, with instruments aboard the near-equatorial AE-E satellite are analyzed to determine the diurnal variations at altitudes from 145 to 295 km. The general trends, including the shift in oxygen phase from afternoon at high altitudes to morning at low altitudes, are reproduced by circulation theories. The oxygen and helium variations show small departures from diffusive equilibrium below 200 km that are consistent with wind-induced diffusion and provide the first direct evidence of transport processes in the diurnal tide of the thermosphere.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; July 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Upper limits on production rate of NO per ion pair (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The maximum production rate of NO per ion pair during a solar proton event has been calculated using an approach described by Porter et al. (1976). For altitudes between 80 and 120 km the calculation yields a limit of 2.68 NO per ion pair for 10 keV electrons, a value which is consistent with the rates implied by the measurements of Arnold (1978) as quoted by Fabian et al. (1979). For altitudes below 80 km the maximum rate of NO production is calculated to be 1.46 to 1.53 NO per ion pair.
    Keywords: GEOPHYSICS
    Type: Nature; 280; July 12
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Tides and the midnight temperature anomally in the thermosphere (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Spectral analysis of the midnight temperature anomaly observed on Atmosphere Explorer-E indicates that the phenomenon can be adequately represented with wave numbers between 1 and 5. Results from a multiconstituent circulation model suggest that this feature and associated variations in composition are the result of a complex interaction between the semidiurnal tide generated in the lower atmosphere and ion-neutral momentum coupling associated with the diurnal variation of the ion density which, in turn, also generates higher order tidal models.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 6; June 197
    Format: text
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