Suprathermal protons in the interplanetary solar wind

Details Suprathermal protons in the interplanetary solar wind Suprathermal protons in the interplanetary solar wind

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2750g&link_type=abstract

Journal of Geophysical Research, vol. 81, June 1, 1976, p. 2750-2754.

Physics

5

Interplanetary Magnetic Fields, Plasma-Particle Interactions, Proton Energy, Solar Wind, Magnetohydrodynamic Waves, Propagation Velocity, Temperature Effects, Velocity Distribution

Scientific paper

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

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