Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-11
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, Proceedings of The 28th International Cosmic Ray Conference, Tsukuba, Japan 2003
Scientific paper
We study the first-order Fermi acceleration process at parallel shock waves by means of Monte Carlo simulations. A 'realistic' model of the magnetic field turbulence is applied involving sinusoidal waves imposed on the background mean field parallel to the shock normal. The finite-amplitude magnetic field perturbations lead to locally oblique field configurations at the shock and the respective magnetic field compression. It results in modification of the particle acceleration process introducing some features observed in oblique shocks, e.g. particle reflections from the shock. For the parallel mildly relativistic shocks we demonstrate for the first time a (non-monotonic) variation of the accelerated particle spectral index with the turbulence amplitude.
Niemiec Jacek
Ostrowski Michal
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