Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1183...66m&link_type=abstract
SHOCK WAVES IN SPACE AND ASTROPHYSICAL ENVIRONMENTS: 18th Annual International Astrophysics Conference. AIP Conference Proceedin
Astronomy and Astrophysics
Astrophysics
Shock Waves, Cosmic Rays, Particle Accelerators, Interplanetary Magnetic Fields, Partial Differential Equations, Planetary Bow Shocks, Interplanetary Shocks, Cosmic Rays, Particle Acceleration, Interplanetary Magnetic Fields, Partial Differential Equations
Scientific paper
Cosmic ray protons accelerated in strong shocks are known to drive various instabilities in the shock precursor. An acoustic instability of the shock precursor driven by the pressure gradient of accelerated particles is studied in the nonlinear regime. After nonlinear steepening of the unstable waves an ensemble of discontinuities, a shocktrain, is created. Traveling wave solutions are obtained analytically and verified dynamically by numerical calculations. By compressing both an ambient and turbulent magnetic fields, and by generating the flow vorticity, the shocktrains not only amplify the magnetic field but also form distinct magnetic structures. These structures change the transport regime of accelerated particles from diffusive (quasi-linear regime) at lower momenta to fractionally kinetic (Levy flights and traps) over an extended momentum interval below the spectrum cut-off. As a result, a spectral break should form, typically at sub-Tev energies and some of the particles of higher energies escape upstream before they reach the cut-off momentum.
Diamond Patrick H.
Malkov M. A.
No associations
LandOfFree
Wave Dynamics and Particle Acceleration in Shock Precursors 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 Wave Dynamics and Particle Acceleration in Shock Precursors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wave Dynamics and Particle Acceleration in Shock Precursors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1535663