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  • 1
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    Macroscopic Lagrangian description of warm plasmas. II Nonlinear wave interactions (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A macroscopic Lagrangian is simplified to the adiabatic limit and expanded about equilibrium, to third order in perturbation, for three illustrative cases: one-dimensional compression parallel to the static magnetic field, two-dimensional compression perpendicular to the static magnetic field, and three-dimensional compression. As examples of the averaged-Lagrangian method applied to nonlinear wave interactions, coupling coefficients are derived for interactions between two electron plasma waves and an ion acoustic wave, and between an ordinary wave, an electron plasma wave, and an ion acoustic wave.
    Keywords: PLASMA PHYSICS
    Type: Radio Science (ISSN 0048-6604); 18; 1369-137
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  • 2
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    A method for classification of multisource data using interval-valued probabilities and its application to HIRIS data (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A method of classifying multisource data in remote sensing is presented. The proposed method considers each data source as an information source providing a body of evidence, represents statistical evidence by interval-valued probabilities, and uses Dempster's rule to integrate information based on multiple data source. The method is applied to the problems of ground-cover classification of multispectral data combined with digital terrain data such as elevation, slope, and aspect. Then this method is applied to simulated 201-band High Resolution Imaging Spectrometer (HIRIS) data by dividing the dimensionally huge data source into smaller and more manageable pieces based on the global statistical correlation information. It produces higher classification accuracy than the Maximum Likelihood (ML) classification method when the Hughes phenomenon is apparent.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA, Goddard Space Flight Center, Multisource Data Integration in Remote Sensing; p 75-81
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  • 3
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    Microscopic Lagrangian description of warm plasmas. IV - Macroscopic approximation (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The averaged-Lagrangian method is applied to linear wave propagation and nonlinear three-wave interaction in a warm magnetoplasma, in the macroscopic approximation. The microscopic Lagrangian treated by Kim and Crawford (1977) and by Galloway and Crawford (1977) is first expanded to third order in perturbation. Velocity integration is then carried out, before applying Hamilton's principle to obtain a general description of wave propagation and coupling. The results are specialized to the case of interaction between two electron plasma waves and an Alfven wave. The method is shown to be more powerful than the alternative possibility of working from the beginning with a macroscopic Lagrangian density.
    Keywords: PLASMA PHYSICS
    Type: Radio Science; 18; Mar
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  • 4
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    A method for classification of multisource data using interval-valued probabilities and its application to HIRIS data (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A method of classifying multisource data in remote sensing is presented. The proposed method considers each data source as an information source providing a body of evidence, represents statistical evidence by interval-valued probabilities, and uses Dempster's rule to integrate information based on multiple data sources. The method is applied to the problems of ground-cover classification of multispectral data combined with digital terrain data such as elevation, slope, and aspect. Then this method is applied to simulated 201-band High Resolution Imaging Spectrometer (HIRIS) data by dividing the dimensionally huge data source into smaller and more manageable pieces based on the global statistical correlation information. It produces higher classification accuracy than the Maximum Likelihood (ML) classification method when the Hughes phenomenon is apparent.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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  • 5
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    Combining multispectral and ancillary data in remote sensing using interval-valued probabilities (1989)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: This paper presents a method for classifying multisource data in remote sensing and geographic information systems using interval-valued probabilities. In this method, each data source is considered as an information source which provides a body of statistical evidence. In order to integrate information obtained from multiple data sources, the method adopts Dempster's rule for combining multiple bodies of evidence. Preliminary experiments have been undertaken to illustrate the use of the method in a supervised ground-cover classification on multispectral data combined with digital elevation data. They demonstrate the ability of the method in capturing information provided by inexact and incomplete evidence when there are not enough training samples to estimate statistical parameters.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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  • 6
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    Ocean Chlorophyll Studies from a U-2 Aircraft Platform (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Chlorophyll gradient maps of large ocean areas were generated from U-2 ocean color scanner data obtained over test sites in the Pacific and Atlantic Oceans. The delineation of oceanic features using the upward radiant intensity relies on an analysis method which presupposes that radiation backscattered from the atmosphere and ocean surface can be properly modeled using a measurement made at 778 nm. An estimation of the chlorophyll concentration was performed by properly ratioing radiances measured at 472 nm and 548 nm after removing the atmospheric effects. The correlation between the remotely sensed data and in-situ surface chlorophyll measurements was validated in two sets of data. The results show that the correlation between the in-situ measured chlorophyll and the derived quantity is a negative exponential function and the correlation coefficient was calculated to be -0.965.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-80574
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  • 7
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    Simplified theory of large-amplitude wave propagation (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An orbit perturbation procedure was applied to the description of monochromatic, large-amplitude, electrostatic plasma wave propagation. In the lowest order approximation, untrapped electrons were assumed to follow constant-velocity orbits and trapped electrons were assumed to execute simple harmonic motion. The deviations of these orbits from the actual orbits were regarded as perturbations. The nonlinear damping rate and frequency shift were then obtained in terms of simple functions. The results are in good agreement with previous less approximate analyses.
    Keywords: PLASMA PHYSICS
    Type: NASA-CR-147229 , SU-IPR-582
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  • 8
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    Approximate theory of large-amplitude wave propagation (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An orbit perturbation procedure is applied to the description of monochromatic, large-amplitude, electrostatic plasma wave propagation. In the lowest-order approximation, untrapped electrons are assumed to follow constant-velocity orbits and trapped electrons are assumed to execute simple harmonic motion. The deviations of these orbits from the actual orbits are regarded as perturbations. The nonlinear damping rate and frequency shift are then obtained in terms of simple functions. The results are in good agreement with previous less approximate analyses. A significant feature of the analysis is that it treats a single wave by techniques previously applied to turbulent spectra. The analysis can consequently be extended to the case of a large-amplitude wave interacting with a lower-amplitude spectrum of waves.
    Keywords: PLASMA PHYSICS
    Type: Journal of Plasma Physics; 17; June 197
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  • 9
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    Microscopic Lagrangian description of warm plasmas. I - Linear wave propagation. II - Nonlinear wave interactions (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: It is pointed out that the conventional iterative analysis of nonlinear plasma wave phenomena, which involves a direct use of Maxwell's equations and the equations describing the particle dynamics, leads to formidable theoretical and algebraic complexities, especially for warm plasmas. As an effective alternative, the Lagrangian method may be applied. It is shown how this method may be used in the microscopic description of small-signal wave propagation and in the study of nonlinear wave interactions. The linear theory is developed for an infinite, homogeneous, collisionless, warm magnetoplasma. A summary is presented of a perturbation expansion scheme described by Galloway and Kim (1971), and Lagrangians to third order in perturbation are considered. Attention is given to the averaged-Lagrangian density, the action-transfer and coupled-mode equations, and the general solution of the coupled-mode equations.
    Keywords: PLASMA PHYSICS
    Type: Radio Science; 12; Nov
    Format: text
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