Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-02-04
Astron.Astrophys.345:298-306,1999
Astronomy and Astrophysics
Astrophysics
10 pages, LaTeX, uses A&A-style and epsf.sty, 8 PostScript figures Astronomy & Astrophysics in press
Scientific paper
In the theory of diffusive acceleration at oblique shock fronts the question of the existence of a discontinuity of energetic particle density is contentious. The resolution of this problem is interesting from a theoretical point of view, and potentially for the interpretation of observations of particle densities at heliospheric shocks and of high-resolution radio observations of the rims of supernova remnants. It can be shown analytically that an isotropic particle distribution at a shock front implies continuity of the particle density -- whether or not the shock is oblique. However, if the obliquity of the shock induces an anisotropy, a jump is permitted. Both semi-analytic computations and Monte-Carlo simulations are used to show that, for interesting parameter ranges, a jump is indeed produced, with accelerated particles concentrated in a precursor ahead of the shock front.
Achterberg Abraham
Gallant Yves A.
Gieseler U. D. J.
Kirk John G.
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