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  • 1
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    The effect of Fresnel phase on scattering from a vegetation layer (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Models for scattering from a vegetation layer treated as a collection of discrete scatterers usually assume far field interaction among scatterers. In a real vegetation medium such as a deciduous forest it is not always true that each leaf is in the far field of the others. This paper examines the additional effect when scatterers are permitted to be in the Fresnel zone. It is found that this in general causes the backscattering coefficient to be higher and also to have a larger rate of increase with frequency than the case of purely far field interaction.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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  • 2
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    Effects of propagation parallel to the magnetic field on the type 1 electrojet irregularity instability (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A simple analysis is presented which indicates that Type 1 irregularities which have a slight component of propagation along the magnetic field may be more unstable than those which propagate across the field. It was found that significant irregularity amplitudes may occur at the northern or southern extremities of the equatorial electrojet from those modes with large north-south group velocity, and they could significantly change our understanding of nonlinear solutions of the electrojet instability.
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-131359 , PUBL-1076 , PPG-137
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  • 3
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    Ordinary-mode electromagnetic instability in colliding plasma streams. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The instability of the electromagnetic linearly polarized mode propagating perpendicularly to the magnetic field is studied for a system composed of two colliding plasma streams, in each of which the electrons and ions are streaming at the same velocity. Using linearized Vlasov-Maxwell equations and allowing for anisotropic temperatures, it is found that in the presence of streaming ions the instability can occur in very low-beta plasmas. The plasma is increasingly susceptible to the electromagnetic instability with increasing values of beta, streaming velocity, temperature ratio of parallel to perpendicular electrons, and temperature ratio of perpendicular electrons to perpendicular ions.
    Keywords: PHYSICS, PLASMA
    Type: Physical Review A - General Physics; vol. 4
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  • 4
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    Geologic interpretation of Skylab photographs (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E76-10199 , NASA-CR-146290 , REPT-75-6
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  • 5
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    Evaluation of Skylab S190-A photos for rock discrimination and comparison with ERTS imagery (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E76-10179 , NASA-CR-146378 , REPT-75-4
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  • 6
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    Geologic and mineral and water resources investigations in western Colorado, using Skylab EREP data (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. Skylab photographs are superior to ERTS images for photogeologic interpretation, primarily because of improved resolution. Lithologic contacts can be detected consistently better on Skylab S190A photos than on ERTS images. Color photos are best; red and green band photos are somewhat better than color-infrared photos; infrared band photos are worst. All major geologic structures can be recognized on Skylab imagery. Large folds, even those with very gentle flexures, can be mapped accurately and with confidence. Bedding attitudes of only a few degrees are recognized; vertical exaggeration factor is about 2.5X. Mineral deposits in central Colorado may be indicated on Skylab photos by lineaments and color anomalies, but positive identification of these features is not possible. S190A stereo color photography is adequate for defining drainage divides that in turn define the boundaries and distribution of ground water recharge and discharge areas within a basin.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E76-10383 , NASA-CR-144513 , REPT-75-7
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  • 7
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    Evaluation of Skylab photography for water resources, San Luis Valley, Colorado (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. Skylab S190A photography used in a stereo mode is sufficient for defining the drainage divides and drainage patterns at the regional level. This data, combined with geologic information, define the boundaries and distribution of ground water recharge and discharge areas within the basin.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E76-10198 , NASA-CR-146289 , REPT-75-5
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  • 8
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    Geological significance of features observed in Colorado from orbital altitudes (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Three major investigations using LANDSAT and Skylab imagery concerned with analyses of color anomalies and linear features of central Colorado are discussed. The studies conducted are concerned with the geological significance of spectral and spatial features on the images. Color anomalies in Skylab photographs were analyzed and evaluated for locating indicators of mineralization. The relationships were determined of all linear features in a LANDSAT image to the rock joint systems and the detectable larger geologic structures; techniques for extracting that geologic information are indicated. Some anomalous megalinear features in LANDSAT and Skylab images are analyzed which transect major structures and, their associated geologic features are described.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: G-10 , NASA. Lyndon B. Johnson Space Center NASA Earth Resources Surv. Symp., Vol. 1-B; p 713-760
    Format: text
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  • 9
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    Diagnostics of accelerating plasma Semiannual progress report, 1 Sep. 1967 - 29 Feb. 1968 (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Current sheet velocities measured in coaxial plasma accelerators with and without refractory insulator linings
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-96774 , REPT.-68-005 , SAPR-4
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  • 10
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    Microwave emission from an irregular snow layer (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Emission from an irregular snow layer is modeled by a layer of Mie scatterers using the radiative transfer method. Comparisons are made with measurements showing snow wetness effects and rough air-snow boundary effects. For convenience of reference, theoretical model behavior is also illustrated.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment (ISSN 0034-4257); 13; 423-437
    Format: text
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