Evidence for the Nonlinear Transport of Galactic Cosmic Rays

Details Evidence for the Nonlinear Transport of Galactic Cosmic Rays Evidence for the Nonlinear Transport of Galactic Cosmic Rays

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...626l..97s&link_type=abstract

The Astrophysical Journal, Volume 626, Issue 2, pp. L97-L99.

Astronomy and Astrophysics

Astronomy

23

Ism: Cosmic Rays, Diffusion, Turbulence

Scientific paper

The measured decrease of the abundance ratio of secondary to primary Galactic cosmic-ray nuclei is explained by the increase of the cosmic-ray parallel mean free path with magnetic rigidity λ∥~R0.6 that results from the weakly nonlinear transport theory of cosmic rays in the turbulent Galactic magnetic fields. Because the ratio of fluctuating to ordered magnetic fields in the Galaxy qL=(δB/B0)2 is large, this nonlinear transport theory has to be favored over the traditional quasi-linear theory that requires very small values qL<<1. Our explanation provides an alternative to Galactic transport theories of cosmic rays with significant distributed stochastic acceleration.

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