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  • 1980-1984  (13)
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  • 11
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    Wave instability in the polar region of Venus (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Infrared and radio observations of the upper cloud region of Venus indicate that the north polar region contains features of large thermal contrast. A cold collar, encompassing a region of temperature inversions, lies between latitudes of about 65 and 75 deg, and a pair of warm features, separated by about 180 deg of longitude and centered near 80 deg latitude, rotate about the pole with a period of about 2.9 days. It is shown that the cold temperatures associated with the inversions lead to an enhancement in the mean zonal wind in a localized area near the pole, and that this enhancement makes the mean flow barotropically unstable. Since data for this region are limited, a model for the thermal structure has been used for calculating growth times and phase periods of the unstable modes. Choosing model parameters to agree as closely as possible with available data, it has been determined that the rotating warm features are likely to be manifestations of barotropically unstable waves.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of the Atmospheric Sciences; 39; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Infrared remote sensing of the atmosphere of Venus from the Pioneer 12 Orbiter (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Pioneer 12 spacecraft, which was placed into orbit about Venus on 4 December 1978, carried a multispectral radiometer designed to investigate the structure and meteorological properties of the middle atmosphere (60 to 140 km). This paper reviews the experiment concept, the design, implementation and calibration of the hardware, and the preliminary scientific results from data obtained through 14 February 1979.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Space research. Volume 20; May 29, 1979 - Jun 09, 1979; Bangalore; India
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    Ageostrophic motions in the stratosphere from satellite observations (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The diagnostic approach used by Palmer (1981) to compare the predictions of the theoretical model of sudden warming in the winter polar stratosphere of Dunkerton et al. (1981) with Tiros-N Stratospheric Sounding Unit data on the event of February 13-17, 1979, is applied to data from the Nimbus-7 Limb IR Monitor of the Stratosphere for the same event. The data are presented as height-latitude cross sections of the zonally averaged zonal wind, the Coriolis terms, and the wave-flux terms and discussed. Some encroachment of easterlies from the equatorial regions into the midlatitudes is observed on February 13, in agreement with the early phase of the model and in contrast to the lack of encroachment seen in the narrower-coverage Tiros-N data, but the further evolution deviates significantly from the model predictions.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Satellite/Remote Sensing and Applications; Jun 25, 1984 - Jun 29, 1984; Clearwater Beach, FL
    Format: text
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