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  • 1975-1979  (3)
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  • 1
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    Suprathermal protons in the interplanetary solar wind (1976)
    American Geophysical Union
    Details
    Publication Date: 1976-06-01
    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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    The kinetic effects of Alfven wave pressure in the solar wind (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The results of a kinetic model for the radial evolution of the proton component of the solar wind in the presence of Alfven waves are presented. The calculation is based on general quasi-linear equations developed to describe the temporal and spatial evolution of the ion distribution functions of a multispecies plasma in presence of waves, using a short wavelength expansion. These equations include new wave-particle interaction terms arising from temporal and spatial inhomogeneities in the plasma. Numerical solutions are obtained of these equations specialized to the case of Alfven waves in a spherically symmetric solar wind. The Alfven wave effects on the proton distribution function vary strongly in velocity space. Protons with small transverse velocities are primarily decelerated with respect to the wave rest frame. This deceleration becomes less important with increasing transverse velocity, as wave induced diffusion to larger transverse velocity becomes the dominant effect. The competition of these effects results in interesting distortions of evolving proton distribution functions which give rise the wave acceleration well known from fluid theory.
    Keywords: SOLAR PHYSICS
    Type: Contrib. to the Fourth Solar Wind Conf.; p 19-25
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Suprathermal protons in the interplanetary solar wind (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Using the Mariner 5 solar wind plasma and magnetic field data, we present observations of field-aligned suprathermal proton velocity distributions having pronounced high-energy shoulders. These observations, similar to the interpenetrating stream observations of Feldman et al. (1974), are clear evidence that such proton distributions are interplanetary rather than bow shock associated phenomena. Large Alfven speed is found to be a requirement for the occurrence of suprathermal proton distribution; further, we find the proportion of particles in the shoulder to be limited by the magnitude of the Alfven speed. It is suggested that this last result could indicate that the proton thermal anisotropy is limited at times by wave-particle interactions
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research; 81; June 1
    Format: text
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    NASA TECHNICAL REPORTS
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