Cosmic-Ray Acceleration at Relativistic Shock Waves in the Presence of Oblique Magnetic Fields with Finite-Amplitude Perturbations

Details Cosmic-Ray Acceleration at Relativistic Shock Waves in the Presence of Oblique Magnetic Fields with Finite-Amplitude Perturbations Cosmic-Ray Acceleration at Relativistic Shock Waves in the Presence of Oblique Magnetic Fields with Finite-Amplitude Perturbations

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264..248o&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 264, NO. 1/SEP1, P. 248, 1993

Astronomy and Astrophysics

Astronomy

20

Acceleration Of Particles - Relativity - Shock Waves - Cosmic Rays

Scientific paper

The process of first-order Fermi acceleration at relativistic shock waves is investigated by means of Monte Carlo particle simulations. The simulations are based on numerical integration of the equations of motion of the particles in a perturbed magnetic field. We consider finite-amplitude field perturbations to be a superposition of sinusoidal static waves. The downstream magnetic field structure is obtained from the upstream one by assuming simple plasma compression at the shock for the frozen magnetic field. For shock waves with oblique mean magnetic fields, we confirm our previous finding of non-monotonic change of spectral index with increasing field perturbation amplitude. It is thus possible to have steep spectra with synchrotron spectral indices below -0.5 in relativistic shocks also. In the case of quasi-perpendicular (superluminal) shocks, the acceleration is reduced to a simple compression for small-amplitude magnetic field perturbations. At larger amplitudes, power-law spectra can be produced, which flatten with growing field perturbations. We present results for a number of shock velocities: 0.5, 0.7, 0.9 and 0.98 times the velocity of light.

Affiliated with

Also associated with

No associations

Rating

Cosmic-Ray Acceleration at Relativistic Shock Waves in the Presence of Oblique Magnetic Fields with Finite-Amplitude Perturbations 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 Cosmic-Ray Acceleration at Relativistic Shock Waves in the Presence of Oblique Magnetic Fields with Finite-Amplitude Perturbations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic-Ray Acceleration at Relativistic Shock Waves in the Presence of Oblique Magnetic Fields with Finite-Amplitude Perturbations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1564452