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  • GEOPHYSICS  (4)
  • 1975-1979  (4)
  • 1910-1914
  • 1900-1904
  • 1
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    A meteor ablation-cluster ion atmospheric sodium theory (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Neutral and ionic forms of sodium form narrow, well-defined layers which peak in the 90-95 km altitude region at midlatitudes. A new theory for the sodium layer is presented, which is found to be in good agreement with existing atmospheric observations as well as available laboratory measurements of rate constants. The layer is believed to result naturally from a meteor ablation source over a chemical sink with vertical transport of Na(+) playing an important role in the layer shape and variation. While the neutral chemistry is believed to consist of chemical equilibrium between Na and NaO, the ion chemistry departs from earlier studies and considers a cluster ion scheme. It is possible that higher-order cluster ions of sodium play a role in the formation of aerosols, through attachment or ion-induced nucleation processes.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 6; Mar. 197
    Format: text
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  • 2
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    A cluster ion chemistry for the mesospheric sodium layer (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A cluster ion chemistry for sodium is developed which relates the Na(+) profile to the Na profile using reactions involving Na(+).N2, Na(+).CO2, and Na(+).H2O. Removal of sodium from the mesosphere is accomplished by the formation of higher order clusters of the form Na(+).(H2O)n which presumably precipitate to the lower atmosphere. This sink is most effective in the 80-85 km altitude range. The chemical equilibrium model is applied to experimental observations of the Na and Na(+) layers.
    Keywords: GEOPHYSICS
    Type: Journal of Atmospheric and Terrestrial Physics; 41; June 197
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  • 3
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    Theoretical and experimental studies of the atmospheric sodium layer (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Atmospheric atomic sodium was studied with a laser radar system. Photocount data were processed using a digital filter to obtain continuous estimates of the sodium concentration versus altitude. Wave-like structures in the sodium layer were observed, and there was evidence for the presence of a standing wave in the layer. The bottomside of the layer was observed to undulate with a period of about 2 1/2 hours, and the layer was observed to broaden through the night. A meteor ablation-cluster ion theory of sodium was developed. The theory shows good agreement with existing atmospheric observations as well as laboratory measurements of rate constants.
    Keywords: GEOPHYSICS
    Type: NASA-CR-157770 , UILU-ENG-78-2501 , AR-79 , (ISSN 0568-0581)
    Format: application/pdf
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  • 4
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    Lidar observations of wave-like structure in the atmospheric sodium layer (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The University of Illinois (Urbana) lidar system has been developed to study the atmospheric sodium layer near 90 km altitude through the mechanism of resonance scattering. The photocount data are processed using digital smoothing filters to obtain continuous estimates of the sodium density versus altitude. The filter cutoff frequency is related to the height resolution and accuracy of the estimated profile. Lidar photocount data processed using this filtering technique show wave-like structures in the sodium layer which move downward with time. The waves have typical wavelengths of 3-15 km and phase velocities of less than 1 m/sec. The movement of these structures seems to be independent of the motion of the bottomside of the layer, which also has been observed to move up or down by as much as 2 km over a period of a few hours.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 5; Aug. 197
    Format: text
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