Particle acceleration and energy distribution in multi-streaming plasmas

Details Particle acceleration and energy distribution in multi-streaming plasmas Particle acceleration and energy distribution in multi-streaming plasmas

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm33c0459m&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM33C-0459

Physics

Space Physics

7835 Magnetic Reconnection (2723, 7526), 7845 Particle Acceleration

Scientific paper

The origin of high-energy particles and their energy distribution is one of the primary challenges facing space physics and astrophysics. We consider two types of events where particle acceleration is observed: shocks and reconnection. We simulate both type of events with a fully kinetic and fully relativistic approach aimed at measuring directly particle acceleration. In each process we observe two types of effects: increase of directed energy (creation of beams) and increase of plasma temperature. The two effects are intertwined as beams interact with the plasma through a variety of beaming instabilities and turn their directed energy into thermal energy. However, often non Maxwellian distributions are observed. Our approach follows two paths. First, we investigate by direct simulation the energy distribution produced by reconnection, shocks and streaming instabilities. Second, we consider a general mathematical formulation that allows us to predict the distribution function of the high-energy particles. In particular, we derive a new approach to demonstrate the physical origin of power laws.

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