On the acceleration of energetic particles in the interplanetary medium

Details On the acceleration of energetic particles in the interplanetary medium On the acceleration of energetic particles in the interplanetary medium

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.4641f&link_type=abstract

Journal of Geophysical Research, vol. 81, Sept. 1, 1976, p. 4641-4645.

Physics

29

Interplanetary Medium, Particle Acceleration, Proton Scattering, Wave Attenuation, Anisotropic Media, Magnetohydrodynamic Waves, Mean Free Path, Solar Protons, Transit Time, Wave Interaction

Scientific paper

The paper examines two possible mechanisms for the acceleration of low energy protons (about 1 MeV) in corotating particle streams in the interplanetary medium - Fermi scattering and transit time damping. It is found that the conditions required for Fermi scattering to be the dominant mechanism appear to be more extreme than those required for transit time damping. It appears that transit time damping of the observed small scale fluctuations in the magnitude of the interplanetary field yields a sufficient acceleration rate, but one should be cautious about concluding that transit time damping is the acceleration mechanism.

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