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Astron. Astrophys. 357, 1133-1136 (2000)

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First order Fermi acceleration at multiple oblique shocks

U.D.J. Gieseler and T.W. Jones

University of Minnesota, Department of Astronomy, 116 Church St. S.E., Minneapolis, MN 55455, USA

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

Send offprint requests to: gieseler@msi.umn.edu

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© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000