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  • 1
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    Variability of the observed temperature, 20-60 km at 80 deg N to 40 deg S (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results are presented for a periodic analysis of atmospheric temperature variations at heights of from 20 to 60 km between 80 deg N and 40 deg S. The analysis is based on Meteorological Rocket Network temperatures not corrected for solar radiation or aliasing by the diurnal tide, and the frequencies examined include the long-term mean, the quasi-biennial oscillation (QBO), and the first six harmonics of the annual wave. Amplitudes are plotted for the long-term mean and QBO as well as for the annual, semiannual, and terannual components. The results show two distinct annual oscillations (the high-latitude one and another above the tropical stratopause) and a polar semiannual wave with two centers of large amplitude that are 90 deg out of phase and separated by a zone of minimum amplitude near 45 km.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Aerospace and Aeronautical Meteorology; Nov 12, 1974 - Nov 15, 1974; El Paso, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Significance of semiannual waves in the mesospheric zonal wind and evidence of influence by the geomagnetic field (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The recently described polar semiannual oscillations in zonal wind can explain midwinter weakening of the polar winter vortex and the relatively short stratospheric and mesospheric summer easterlies. This explanation implies that stratospheric sudden warmings may be caused or affected by the polar semiannual oscillation. Two potential physical mechanisms (not mutually exclusive) for the oscillation are presented: planetary wave action and changes in the radiation field. Radiation absorption changes are suggested to result from changes in ozone concentration during magnetic storms. Contours of amplitude of both the polar and tropical semiannual wind oscillations are more nearly congruent with geomagnetic than with geographic latitude.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: AD-A136747 , Journal of Geophysical Research; 79; Nov. 20
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    NASA TECHNICAL REPORTS
  • 3
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    Determination of optical parameters of atmospheric particulates from ground-based polarimeter measurements (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: This paper describes the theoretical analysis that is required to infer, from polarimeter measurements of skylight, the size distribution, refractive index and abundance of particulates in the atmosphere. To illustrate the viability of the method, some data obtained at UCLA is analyzed and the atmospheric parameters are derived. The explicit demonstration of the redundancy in the description of aerosol distributions suggests that radiation field measurements will not uniquely determine the modal radius of the size distribution. In spite of this nonuniqueness information useful to heat budget calculations can be derived.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Royal Meteorological Society; vol. 100
    Format: text
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  • 4
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    Multi-spectral extinction measurements to deduce the complex refractive index and the size distribution of aerosol particles (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences; 31; Nov. 197
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  • 5
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    Interpretations of the EOLE experiment. I - Temporal variation of Eulerian quantities (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The EOLE data were obtained on the basis of the interrogation of nearly 500 constant density balloons by a satellite in a 50 deg inclined orbit with an orbital time of about 100 min. The isosteric surface in which the balloons operated closely approximates the 200-mb isobaric surface. Ambient temperature and pressure were determined by instruments. Lagrangian velocities were calculated from balloon displacements between successive satellite orbits. The properties of the EOLE data are considered together with averaging schemes and data problems, time sections, and questions of hemispheric energetics.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences; 31; Oct. 197
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  • 6
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    A remote sensing study of Pacific hurricane Ava (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Aircraft, Skylab, NOAA-2, ATS-3, and NIMBUS-5 recently obtained a variety of measurements of Pacific hurricane Ava. These measurements are unusually broad in scope and include satellite observed passive microwave emissivities at 13.9 and 19.5 GHz, active microwave scattering cross-sections at 13.9 GHz, and near infrared and visible images. Essentially simultaneous aircraft measurements of wind speed, waves, whitecaps, 1.4 and 13-15 GHz passive microwave emissivities, 1.4 GHz active microwave images, sea surface temperatures, pressure fields, and aerosol size distributions were also obtained. A brief description of sensors and platforms is presented along with some in-depth details of results obtained.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: International Symposium on Remote Sensing of Environment; Apr 15, 1974 - Apr 19, 1974; Ann Arbor, MI
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    NASA TECHNICAL REPORTS
  • 7
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    Review of Nimbus-5 Microwave Spectrometer results (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Nimbus-E Microwave Spectrometer (NEMS) data are analyzed, especially those obtained from the 53.65, 54.9, and 58.8 GHz channels, corresponding to sensing at 4, 11, and 18 km respectively. The observations permit highly precise horizontal temperature profiles to be established and are hardly affected by clouds. The sensings of the 54.9 GHz channel unambiguously delineate wave structure on the equator. Horizontal water vapor profiles are derived from the 22.235 and 31.4 GHz channel data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Aerospace and Aeronautical Meteorology; Nov 12, 1974 - Nov 15, 1974; El Paso, TX
    Format: text
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    NASA TECHNICAL REPORTS
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