Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238..435o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 435-438.
Astronomy and Astrophysics
Astrophysics
17
Cosmic Rays, Particle Acceleration, Particle Diffusion, Relativistic Particles, Energy Spectra, Extragalactic Radio Sources, Magnetic Field Configurations, Particle Energy, Velocity Distribution
Scientific paper
A mechanism of diffusive particle acceleration at a tangential discontinuity of the velocity field involving relativistic velocities is discussed. The acceleration is due to the fact that a particle moving diffusively close to a discontinuity experiences on average an energy gain every time after crossing it. The case of ultrarelativistic flow velocities results in very flat energy spectra for the accelerated particles, only weakly depending on the background conditions near the discontinuity. For lower - but still relativistic - velocities a flat spectrum can still be obtained, provided the conditions near the discontinuity are favorable. The time-scale of the acceleration process is rather short, but which, however, increases with decreasing flow velocity. The discussed acceleration mechanism produces a drag force onto both sides of the discontinuity, tending to smooth it out.
No associations
LandOfFree
Diffusive acceleration of cosmic ray particles at tangential discontinuity of velocity field 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 Diffusive acceleration of cosmic ray particles at tangential discontinuity of velocity field, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diffusive acceleration of cosmic ray particles at tangential discontinuity of velocity field will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-838541