A Nonlinear Energy Balance Model of Particle Acceleration by Collisionless Parallel Shock Waves

Details A Nonlinear Energy Balance Model of Particle Acceleration by Collisionless Parallel Shock Waves A Nonlinear Energy Balance Model of Particle Acceleration by Collisionless Parallel Shock Waves

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...669l.109g&link_type=abstract

The Astrophysical Journal, Volume 669, Issue 2, pp. L109-L112.

Astronomy and Astrophysics

Astronomy

5

Acceleration Of Particles, Methods: Numerical, Shock Waves

Scientific paper

We describe in this Letter a new way to model processes of particle acceleration in quasi-parallel shocks and report some promising preliminary results of numerical analysis. The treatment of plasma and waves is self-consistent and time-dependent but nevertheless relatively simple from a physical point of view. The model assumes that resonant wave-particle interaction is the most important mechanism for both shock formation and particle acceleration but does not use the diffusion-convection approach for the interaction. Instead it uses conservation laws and resonance conditions to find where waves will be generated or dumped and hence particles pitch-angle scattered. Because the distribution function for bulk plasma and not just the high-energy tail is included in the model, no special bootstrap or termination assumptions are required (neither the introduction of a separate population of seed particles nor some ad hoc escape rate of accelerated particles is needed). In spite of all the simplicity, the preliminary results not only show remarkable agreement with diffusive shock acceleration models in the prediction of power spectra for accelerated particles in the upstream region but also reveal the presence of a spectral break in the high-energy part of the spectra. The results also confirm that acceleration can start from the thermal particles and confirm the importance of second-order Fermi acceleration.

Affiliated with

Also associated with

No associations

Rating

A Nonlinear Energy Balance Model of Particle Acceleration by Collisionless Parallel Shock Waves 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 A Nonlinear Energy Balance Model of Particle Acceleration by Collisionless Parallel Shock Waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Nonlinear Energy Balance Model of Particle Acceleration by Collisionless Parallel Shock Waves will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1696936