Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...437....1v&link_type=abstract
Astronomy and Astrophysics, Volume 437, Issue 1, July I 2005, pp.1-8
Astronomy and Astrophysics
Astrophysics
4
Acceleration Of Particles, Magnetohydrodynamics (Mhd), Plasmas, Shock Waves, Turbulence, Waves
Scientific paper
We calculate the evolution of Alfvén waves in super-Alfvénic flows, such as the downstream region of a fast-mode shock, via three-wave interactions between two Aflvén waves and a sound wave. We show that the process has a significant influence on the evolution of the Alfvén wave spectra, driving the system toward a degenerate normalized cross-helicity, Hc→±1. Typical distances in which the system evolves are evaluated, and the effects of the calculated turbulence evolution on test-particle acceleration in super-Alfvénic quasi-parallel shocks are studied. We show that typically the spectrum of accelerated particles is determined by the first-order Fermi acceleration process as described earlier by Vainio & Schlickeiser (1998, A&A, 331, 793; 1999, A&A, 343, 303), and identify some regions of parameter space, where the earlier results are significantly modified either by changes in the predicted scattering-center compression ratio or by stochastic acceleration in the downstream plasma.
Spanier Felix
Vainio Rami
No associations
LandOfFree
Evolution of Alfvén waves by three-wave interactions in super-Alfvénic shocks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evolution of Alfvén waves by three-wave interactions in super-Alfvénic shocks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of Alfvén waves by three-wave interactions in super-Alfvénic shocks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1432248