Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe...3p&link_type=abstract
"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 3-3"
Astronomy and Astrophysics
Astrophysics
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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