On the nature of small amplitude Fermi acceleration

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrodynamics, Charged Particles, Magnetohydrodynamic Waves, Particle Acceleration, Plasma-Particle Interactions, Turbulence Effects, Cerenkov Radiation, Energetic Particles, Magnetic Pumping, Magnetosonic Resonance, Particle Diffusion, Pitch (Inclination), Plasma Resonance

Scientific paper

It is demonstrated that the expressions obtained by various authors for the acceleration of particles by long wavelength hydromagnetic waves can all be derived by considering the quasi-linear theory of wave-particle interactions with fast magnetosonic waves at the Cerenkov resonance. The necessary condition for the continued acceleration is that efficient pitch angle scattering keep the distribution of the accelerated particles isotropic. The implications of particle acceleration under astrophysical conditions are discussed.

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