Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....6.2054v&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
4
Scientific paper
Energetic proton acceleration and transport through self-generated Alfv´en waves in vicinity of a lowMach-number parallel shock wave is considered employing Monte Carlo simulations. The large scattering-center compression ratio predicted by the Alfv´en-wave transmission through such a shock leads to a strong increase of the particle pressure as t → ∞ in the test-particle approximation. As the pressure of the energetic particles becomes dynamically important, the energetic particles can modify the cross-helicity of the downstream waves to turn away from the shock at certain distance downstream the shock front. This leads to a finite size of the scattering region with large compression ratio, providing a mechanism for the shock to self-regulate its accleration efficiency.
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