Chaotic ion motion in magnetosonic plasma waves

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Ion Motion, Magnetosonic Resonance, Plasma Waves, Stochastic Processes, Distribution Functions, Plasma Diffusion, Solar Flares, Thermalization (Energy Absorption)

Scientific paper

The motion of test ions in a magnetosonic plasma wave is considered, and the 'stochasticity threshold' of the wave's amplitude for the onset of chaotic motion is estimated. It is shown that for wave amplitudes above the stochasticity threshold, the evolution of an ion distribution can be described by a diffusion equation with a diffusion coefficient D approximately equal to 1/v. Possible applications of this process to ion acceleration in flares and ion beam thermalization are discussed.

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