The acceleration of energetic particles in the interplanetary medium by transit time damping

Physics

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Interplanetary Magnetic Fields, Interplanetary Medium, Particle Acceleration, Protons, Transit Time, Damping, Ion Motion, Kinetic Energy, Particle Interactions

Scientific paper

It has been reported recently by McDonald et al. (1976) that 1-MeV protons may undergo considerable acceleration in corotating streams. It has also been suggested recently by Fisk et al. (1974b) that interstellar neutral particles which are ionized in the solar cavity may be accelerated in the solar wind and may account for the anomalous component that is observed in low-energy cosmic rays (at about 10 MeV/nucleon). The present study shows that the particles in both of these cases could be accelerated by transit time damping propagating fluctuations in the magnitude of the interplanetary magnetic field (e.g., magnetosonic waves). The protons in corotating streams may be accelerated by transit time damping the small-scale variations in the field magnitude that are observed at a low level in the inner solar system. The interstellar ions may be accelerated by transit time damping large-scale field variations in the outer solar system.

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