Cross helicity of self-generated Alfven waves downstream a parallel shock

Physics

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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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