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  • 11
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    Observations of energetic electrons /E no less than about 200 keV/ in the earth's magnetotail - Plasma sheet and fireball observations (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An earlier paper by the authors (1976) has reported on energetic electron anisotropies observed in conjunction with the acceleration regions identified by Frank et al., (1976). The present paper gives more detailed analyses of observations in the distant plasma sheet, including specific features of intensities, energy spectra, and pitch angle distributions of the very energetic electrons associated with intense plasma particle events, with energies ranging between 50 eV and 45 keV, detected with an electron/isotope spectrometer aboard the earth-orbiting spacecraft Imp 8. Two domains are considered: the plasma sheet and the regions near and within the localized magnetotail acceleration regions known as the fireball regions. The instrumentation used offered a number of observational advantages over many previous studies, including inherently low background, large geometric factors, excellent species identification, good angular distribution measurement capability, and availability of high resolution of differential intensities.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; Apr. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Morphological mapping of Martian outflow channels (1978)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Geomorphic mapping of selected portions of Martian outflow channels was performed in order to facilitate comparisons to terrestrial landforms. We interpret the maps to illustrate a correspondence between Martian channel features and terrestrial landforms developed by catastrophic flood erosion in the Channeled Scabland. The following features all occur in remarkably similar arrangements on the flood-channel floors of both planets: streamlined uplands, longitudinal grooves, scour marks, inner channel cataracts, etched zones, and possible pendant bars.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    A preliminary assessment of the fluid erosional processes that shaped the Martian outflow channels (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Catastrophic floods may be the mechanism which created Martian outflow channels and the distinctive assemblage of channel landforms, including regional and local anastomosing patterns, expanding and contracting reaches correlated with flow constrictions, streamlined uplands, inner channels with recessional headcuts, pendant forms on the downcurrent sides of flow obstacles, and scour marks around the obstacles. A terrestrial landscape which contains analogs to all the Martian outflow features is the Channeled Scabland of eastern Washington, formed by catastrophic flooding across differentially resistant basalt, loess and sedimentary rock. Both hydrodynamic theory and the properties of the boundary undergoing deformation need to be considered in studying the forms that result from catastrophic flooding.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
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