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First order Fermi acceleration at multiple oblique shocks
U.D.J. Gieseler and
Received 14 October 1999 / Accepted 2 March 2000
Numerical results for particle acceleration at multiple oblique shocks are presented. We calculate the steady state spectral slope of test particles accelerated by the first order Fermi process. The results are compared to analytical treatments for parameters where the diffusion approximation does apply. Effects of injection and finite shock extent are included phenomenologically. We find the spectrum of accelerated particles to harden substantially at multiple oblique shocks and discuss the influence of the number of shocks compared to the obliquity itself.
Key words: acceleration of particles shock waves methods: numerical ISM: cosmic rays
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Online publication: June 5, 2000