Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-09
Mon.Not.Roy.Astron.Soc.362:833-837,2005
Astronomy and Astrophysics
Astrophysics
6 pages, 2 figures
Scientific paper
10.1111/j.1365-2966.2005.09322.x
Cosmic ray particles are more rapidly accelerated in oblique shocks, with the magnetic field inclined with respect to the shock normal direction, than in parallel shocks, as a result of mirror reflection at the shock surface and slower diffusion in the shock normal direction. We investigate quantitatively how these effects contribute to reducing the acceleration time over the whole range of magnetic field inclinations. It is shown that, for quasi-perpendicular inclination, the mirror effect plays a remarkable role in reducing the acceleration time; whereas, at relatively small inclination, the anisotropic diffusion effect is dominant in reducing that time. These results are important for a detailed understanding of the mechanism of particle acceleration by an oblique shock in space and heliosphereic plasmas.
Honda Makoto
Honda Yasuko. S.
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