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  • 1985-1989  (3)
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  • 1
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    Unknown
    Effects of irregularity anisotropy on Faraday polarization fluctuations (1989)
    American Geophysical Union
    Details
    Publication Date: 1989-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
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    Effects of irregularity anisotropy on Faraday polarization fluctuations (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The previous model (Lee et al., 1982) of the Faraday polarization fluctuations (FPF) is extended after taking into account the anisotropic nature of the commonly observed, rodlike and sheetlike ionospheric irregularities. Striking effects of irregularity anisotropy are found in the longitudinal radio propagation. However, if the wave propagation angle is not small (say, greater than 5 deg), the effects of irregularity anisotropy on FPF introduced by rodlike irregularities weaken significantly, while those caused by sheetlike irregularities remain prominent. Therefore, under the same ionospheric propagation conditions, sheetlike ionospheric irregularities are more effective than rodlike ionospheric irregularities in causing the FPF of radio waves. It is expected that intense FPF of VHF radio signals can be observed not only near the equatorial anomaly but also in the auroral region.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 94; 15421-15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Theoretical models for polarimetric microwave remote sensing of earth terrain (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Using the two-layer anisotropic random medium, a mathematically rigorous, fully polarimetric model is developed to compute the Mueller and covariance matrices in the backscattering direction for various kinds of earth terrain. The electric field is first written in the form of an integral equation involving the unperturbed dyadic Green's function in the absence of the permittivity fluctuations. The integral equation is then solved by an iterative series known as the Born series. With only the first term of the series, which physically describes a single scattering process, the fully polarimetric backscattering coefficients are derived. Four different kinds of upgoing and downgoing waves exist due to the excitation of both ordinary and extraordinary waves in the anisotropic random medium. An averaging scheme over the azimuthal direction is used to simulate the effects on the radar backscattering due to the azimuthal randomness in the growth direction of leaves in tree and grass fields.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Journal of Electromagnetic Waves and Applications (ISSN 0920-5071); 3; 1 19
    Format: text
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    NASA TECHNICAL REPORTS
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