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  • GEOPHYSICS  (465)
  • 2000-2004
  • 1975-1979  (465)
  • 1970-1974
  • 1978  (465)
  • 1
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    The Limb Infrared Monitor of the Stratosphere (LIMS) experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: The Limb Infrared Monitor of the Stratosphere is used to obtain vertical profiles and maps of temperature and the concentration of ozone, water vapor, nitrogen dioxide, and nitric acid for the region of the stratosphere bounded by the upper troposphere and the lower mesosphere.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center The Nimbus 7 User's Guide; p 71-104
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Microwave radiometer measurement of water vapor path delay: Data reduction techniques (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Data reduction techniques are developed to compensate for water vapor path delay, a limiting error source in geodetic measurements made with very long baseline interferometry and in radio ranging to spacecraft. It is shown that water vapor path delay is proportional to a linear combination of saturation-corrected sky brightness temperatures, measured on and off the water vapor line. The effects of emission from liquid water droplets in clouds as well as most of the oxygen emission are removed by the off-line channel. Sky brightness temperatures are saturation-corrected or 'linearized' using estimates of effective sky temperatures made from surface temperature. Tipping curves are used to remove instrumental error. Coefficients are found by two methods: from a regression analysis of measured brightness temperatures versus radiosonde measured delay, and from a regression analysis of theoretical brightness temperatures versus radiosonde measured delay. In each case the coefficients are adjusted for differing climatic conditions by measurements of surface temperature, pressure, and relative humidity. Regression solutions are constrained to remove liquid water contributions and to give the correct slope for radiometer versus radiosonde path delay.
    Keywords: GEOPHYSICS
    Type: The Deep Space Network; p 22-30
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    NASA TECHNICAL REPORTS
  • 3
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    The Stratospheric and Mesospheric Sounder (SAMS) experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Thermal emission and solar resonance fluorescence from the atmospheric limb are reported. Global measurements are made of radiation from the molecular species. The gas correlation spectroscopy technique based on the use of gas cells to select emission from chosen spectral lines or from particular parts of spectral lines is used. The source function and departure from the thermodynamic equilibrium between 80 and 130 kilometers associated with CO2 emission bands were investigated. The zonal wind velocity component along the line of sight is measured.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center The Nimbus 7 User's Guide; p 139-174
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  • 4
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    The Earth Radiation Budget (ERB) experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: The radiation budget of the earth on both synoptic and planetary scales by simultaneous measurement of incoming solar radiation and outgoing earth reflected (shortwave) and emitted (longwave) radiation was determined. Both fixed wide angle sampling of terrestrial fluxes at the satellite altitude, and scanned narrow-angle sampling of the radiance components, dependent on angle are used to determine outgoing radiation. Measurements of radiation are obtained in 22 different optical channels.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center The Nimbus 7 User's Guide; p 33-58
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    NASA TECHNICAL REPORTS
  • 5
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    Stratospheric Aerosol Measurement (SAM 2) experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: The Stratospheric Aerosol Measurement 2 (SAM 2) is used to map the concentration and optical properties of stratospheric aerosols as a function of altitude, latitude, and longitude. The vertical distribution of the stratospheric aerosols in the polar regions of both hemispheres is provided.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center The Nimbus 7 User's Guide; p 105-138
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  • 6
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    Thermal structure of the primitive ionosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Exospheric neutral and electron temperatures have been estimated for the primitive upper atmosphere and ionosphere with various oxygen content in the scheme of our previous model (Shimizu and Shimazaki, 1976). The exospheric neutral temperature has been shown to be rather insensitive to the change of oxygen content, justifying our previous assumption for the temperature variation, while the exospheric electron temperature has been found to be quite sensitive to the compositional change, mainly owing to the strong dependence of electron density on the oxygen concentration.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Jan. 1
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  • 7
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    The evolution of the atmosphere of the earth (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Computer simulations of the evolution of the earth's atmospheric composition and surface temperature have been carried out. The program took into account changes in the solar luminosity, variations in the earth's albedo, the greenhouse effect, variation in the biomass, and a variety of geochemical processes. Results indicate that prior to two billion years ago the earth had a partially reduced atmosphere, which included N2, CO2, reduced carbon compounds, some NH3, but no free H2. Surface temperatures were higher than now, due to a large greenhouse effect. When free O2 appeared the temperature fell sharply. Had earth been only slightly further from the sun, runaway glaciation would have occurred at that time. Simulations also indicate that a runaway greenhouse would have occurred early in earth's history had earth been only a few percent closer to the sun. It therefore appears that, taking into account the possibilities of either runaway glaciation or a runaway greenhouse effect, the continuously habitable zone about a solar-type star is rather narrow, extending only from roughly 0.95 to 1.01 AU.
    Keywords: GEOPHYSICS
    Type: Icarus; 33; Jan. 197
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  • 8
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    Geographical variations of NO and O3 in the lower stratosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Nitric oxide and ozone concentrations in the lower stratosphere have been measured from a high-altitude research aircraft using in situ measuring techniques. Results of several geographical surveys are presented along with predictions of two two-dimensional stratospheric models. Meridional and zonal data were obtained in June 1974 and in June, July, and August 1975. At longitudes 122-158 deg W the meridional data taken between 5 and 80 deg N latitude show an increasing NO concentration with latitude, by a factor of 4 at 21-km altitude and a less marked increase at 18 km. The minimum NO concentration at 21 km is observed at 5 deg N latitude and is about 6 x 10 to the 8th power/cu cm. Zonal data at latitudes 22-38 deg N taken from 55 to 176 deg N longitude show little variation of the NO and O3 concentrations with longitude.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Apr. 20
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  • 9
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    Mass spectrometric measurements in the lower thermosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Several types of spectrometers are discussed along with their methods of operations. The open source magnetic deflection type mass spectrometer and the quadrupole mass spectrometer are described in detail. The calibration and mounting procedures used for satellite-borne mass spectrometers were reviewed.
    Keywords: GEOPHYSICS
    Type: Alabama Univ. UAH(NASA Workshop on the Use of a Tethered Satellite System; p 120-129
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  • 10
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    In situ measurement of reactive neutral constituents in the thermosphere by atomic and molecular resonance fluorescence (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The Tethered Satellite System in combination with in situ atomic and molecular resonance fluorescence techniques can treat the problem of simultaneously determining the absolute density of atomic and molecular species known to control the photochemical structure of the upper atmosphere. Two familities of reactants which can be treated by these techniques are the nitrogen oxygen family and the hydrogen oxygen family.
    Keywords: GEOPHYSICS
    Type: Alabama Univ. UAH(NASA Workshop on the Use of a Tethered Satellite System; p 111-118
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