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  • GEOPHYSICS  (1)
  • General  (1)
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    Plasmasphere formation in arbitrarily oriented magnetospheres (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The formation of plasmaspheres in planetary magnetospheres with arbitrary orientations of the rotation and magnetic dipole axes is investigated. A traditional plasmasphere with closed orbits inside the plasmapause and open trajectories outside it only occurs for the limiting case of aligned rotation and dipole axes. A time-variable plasmapause exists if the rotation axis is perpendicular to the solar win flow direction. In any other case, no definite plasmapause exists. Solar wind-driven convection transports plasma throughout the magnetosphere with an effectiveness which increases as the orientation goes further from one of the two limiting cases of strict plasmapause formation. The present analysis is applied to earth and Uranus using the actual orientations of the rotation and dipole axes. Particle trajectories at earth deviate only slightly from those obtained with traditional models. Uranus has no plasmasphere, and plasma convects sunwards throughout the inner magnetosphere.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 13; 624-627
    Format: text
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  • 2
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    Proton Straggling in Thick Silicon Detectors (2017)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Straggling functions for protons in thick silicon radiation detectors are computed by Monte Carlo simulation. Mean energy loss is constrained by the silicon stopping power, providing higher straggling at low energy and probabilities for stopping within the detector volume. By matching the first four moments of simulated energy-loss distributions, straggling functions are approximated by a log-normal distribution that is accurate for Vavilov k is greater than or equal to 0:3. They are verified by comparison to experimental proton data from a charged particle telescope.
    Keywords: General
    Type: GSFC-E-DAA-TN43221 , Nuclear Instruments and Methods in Physics Research B (ISSN 0168-583X); 394; 145-152
    Format: text
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