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  • GEOPHYSICS  (2,227)
  • SOLAR PHYSICS  (1,193)
  • 1975-1979  (3,420)
  • 1
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    Kerogen structures in recently-deposited algal mats at Laguna Mormona, Baja California: A model system for the determination of kerogen structures in ancient sediments (1977)
    In:  CASI
    Details
    Publication Date: 2005-02-28
    Keywords: GEOPHYSICS
    Type: Res. in the Space Sci., Vol. 2, No. 1; 29 p
    Format: text
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  • 2
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    Soviet short-term forecasts of active region evolution and flare activity (1979)
    In:  CASI
    Details
    Publication Date: 2009-11-16
    Description: The structure and strength of the magnetic fields of the Sun's active regions were studied to obtain information for short term forecasting. Intensity forecasts were then made using the information obtained on the gradients of the magnetic fields between sunspots of opposite polarity. A comparison of flare forecasting methods is presented.
    Keywords: SOLAR PHYSICS
    Type: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 72-88
    Format: text
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  • 3
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    Mathematical modelling of undrained clay behavior (1976)
    In:  CASI
    Details
    Publication Date: 2006-08-09
    Description: The proposed general analytical model describes the anisotropic, elastoplastic, path-dependent, stress-strain properties of inviscid saturated clays under undrained conditions. Model parameters are determined by using results from strain-controlled simple shear tests on a saturated clay. The model's accuracy is evaluated by applying it to predict the results of other tests on the same clay, including monotonic and cyclic loading. The model explains the very anisotropic shear strength behavior observed for weak marine clays.
    Keywords: GEOPHYSICS
    Type: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1; p 95-102
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  • 4
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    Some basic considerations of measurements involving collimated direct sunlight (1976)
    In:  CASI
    Details
    Publication Date: 2006-08-09
    Description: For abstract, see N77-26622.
    Keywords: SOLAR PHYSICS
    Type: Terrest. Photovoltaic Meas., 2; p 233-246
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  • 5
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    The solar spectrum at typical clear weather days (1976)
    In:  CASI
    Details
    Publication Date: 2006-08-09
    Description: The solar spectrum in the range of 300 is less than lambda is less than 1500nm is given for five typical clear weather days. These days are selected to represent typical seasonal conditions in respect to airmass water vapor, ozone, and turbidity. Present data are reviewed, and specific conditions are selected. The spectral distribution of the irradiance is given for the direct component, the scattered skylight, the total flux on a horizontal surface, and the flux on an inclined surface normal to the direct beam.
    Keywords: SOLAR PHYSICS
    Type: NASA. Lewis Res. Center Terrest. Photovoltaic Meas., 2; p 17-58
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  • 6
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    Monitoring solar radiation: The ERDA program (1976)
    In:  CASI
    Details
    Publication Date: 2006-08-09
    Description: An overview of the Energy Research and Development Administration planned insolation data network is described. The design of the network is predicated on an analysis and definition of user requirements. Research and analysis projects covering data collection, forecasting and extrapolation are presented.
    Keywords: SOLAR PHYSICS
    Type: NASA. Lewis Res. Center Terrest. Photovoltaic Meas., 2; p 1-17
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  • 7
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    Experience with the inversion of Nimbus 4 BUV measurements to retrieve the ozone profile (1977)
    In:  CASI
    Details
    Publication Date: 2006-05-22
    Description: The relative merits of pressure increment and partial derivative formulations of the ozone inversion problem are discussed briefly. The height range of validity of the retrieved ozone profile and the effects of adding wavelengths to or of dropping wave-length from the inversion system are indicated. Illustrative results are presented for profiles retrieved from BUV data using Backus-Gilbert, minimum information (Twomey), and quasi-optimum procedures.
    Keywords: GEOPHYSICS
    Type: NASA. Langley Res. Center Inversion Methods in Atmospheric Remote Sounding; p 577-597
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  • 8
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    The inversion of stratospheric aerosol and ozone vertical profiles from spacecraft solar extinction measurements (1977)
    In:  CASI
    Details
    Publication Date: 2006-05-22
    Description: The inversions of multi-channel solar extinction measurements have been analyzed for the 0.35-1.0 micron wavelength region to retrieve stratospheric aerosol and ozone vertical profiles using both the constrained linear inversion scheme and the iterative scheme. The inversions of the multi-wavelength solar extinction data obtained from spacecraft have been analyzed based on the inversion of computer simulated data using various atmospheric models with differing amounts of aerosol and ozone in the stratosphere. The sensitivities of the inversion schemes to different experimental errors are discussed in terms of accuracy and resolution of the retrieved profiles.
    Keywords: GEOPHYSICS
    Type: NASA. Langley Res. Center Inversion Methods in Atmospheric Remote Sounding; p 505-527
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  • 9
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    Application of modified Twomey techniques to invert lidar angular scatter and solar extinction data for determining aerosol size distributions (1977)
    In:  CASI
    Details
    Publication Date: 2006-05-22
    Description: Polarization properties of the angularly scattered laser light from a volume of air are used to determine the size distribution of the aerosol particles within the volume by the use of appropriate inversion techniques. Similar techniques are employed to determine a mean size distribution of the particulates within a vertical column through the atmosphere from determinations of the aerosol optical depth as a function of wavelength. In both of these examples, a modification of an inversion technique originally described by Twomey has been employed. Details of this method are presented as well as results from actual measurements employing bistatic lidar and solar radiometer.
    Keywords: GEOPHYSICS
    Type: NASA. Langley Res. Center Inversion Methods in Atmospheric Remote Sounding; p 469-503
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  • 10
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    Application of statistical inversion to ground-based microwave remote sensing of temperature and water vapor profiles (1977)
    In:  CASI
    Details
    Publication Date: 2006-05-22
    Description: Surface-based observations of downwelling microwave thermal emission are related to temperature and humidity profiles via a standard integral equation of radiative transfer. Both in clear and in cloudy atmospheres, statistical inversion techniques are used to retrieve profiles from a data vector of brightness observations and surface meteorological constraints. For the clear case, accuracy predictions and profile retrievals are illustrated for: (1) single frequency angular scanned data; (2) multi-frequency angular scanned data; and (3) multi-frequency zenith data. For the last case predicted and achieved accuracies were compared in a recently conducted radiometric experiment. Retrievals of cloud contaminated radiometric data are elaborated.
    Keywords: GEOPHYSICS
    Type: NASA. Langley Res. Center Inversion Methods in Atmospheric Remote Sounding; p 395-427
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