Center for Astrophysics Research and Technologies Seminar Series
Towards Understanding of Shock Acceleration
Presented by Andrey Beresnyak (LANL)
Acceleration of cosmic rays in supernova remnants is probably the best studied case of shock acceleration. It is hypothesized to produce cosmic rays up to energies of 10^15 eV. The observed thin X-ray rims and short timescale variability suggest strong amplification of magnetic field near the shock. In fact: a) without field amplification *in front* of the shock the acceleration will be negligible; b) the amplification in front of the shock requires the action of cosmic rays themselves. I will overview some popular approaches to solve this problem, such as streaming instability, Bell instability and turbulence excited by the baroclinic term. I will also talk about some recent progress and discuss if it is possible to explain rapid acceleration, as well as rapid variability.
2:00 pm, Thursday, February 13, 2014
PAIS-2540, PAIS
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