Stochastic Particle Acceleration by Plasma Turbulence

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Particle acceleration takes place in many astrophysical setting and is manifested as Cosmic Rays or nonthermal particle (mainly electron) spectra in many sources of radiation. Shock acceleration is commonly invoked to describe these phenomena. However, in most mechanisms of acceleration, including shocks, plasma waves and turbulence appear to play a prominent role. Moreover, because of the high Reynold numbers prevailing in astrophysical plasmas turbulence is expected to be present. In this review the role of turbulence will be described and, in particular, its role in directly accelerating particles stochastically, as envisioned originally by Fermi, will be discussed. A brief review of astrophysical sources where this process may be important will be presented.

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