Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...496..129l&link_type=abstract
Astronomy and Astrophysics, Volume 496, Issue 1, 2009, pp.129-131
Astronomy and Astrophysics
Astrophysics
2
Cosmic Rays, Galaxies: Halos, Scattering
Scientific paper
Context: Particle transport in many astrophysical problems can be described either by the Fokker-Planck equation or by an equivalent system of stochastic differential equations. Aims: It is shown that the latter method can be applied to the problem of defining the size of the cosmic-ray galactic halo. Methods: Analytical expressions for the leading moments of the pitch-angle distribution of relativistic particles are determined. Particle scattering and escape are analyzed in terms of the moments. Results: In the case of an anisotropic distribution, the first moment leads to an expression for the halo size, identified with the particle escape from the region of strong scattering. Previous studies are generalized by analyzing the case of a strictly isotropic initial distribution. A new expression for the variance of the distribution is derived, which illustrates the anisotropization of the distribution. Conclusions: Stochastic calculus tools allow one to analyze physically motivated forms for the scattering rate, so that a detailed realistic model can be developed.
No associations
LandOfFree
Estimating the size of the cosmic-ray halo using particle distribution moments 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 Estimating the size of the cosmic-ray halo using particle distribution moments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Estimating the size of the cosmic-ray halo using particle distribution moments will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1397006