Non-linear momentum diffusion of heliospheric cosmic rays

Details Non-linear momentum diffusion of heliospheric cosmic rays Non-linear momentum diffusion of heliospheric cosmic rays

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.371.1898s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 371, Issue 4, pp. 1898-1902.

Astronomy and Astrophysics

Astronomy

1

Diffusion: Turbulence: Cosmic Rays, Diffusion, Turbulence, Cosmic Rays

Scientific paper

Besides parallel and perpendicular spatial diffusion, momentum diffusion can be seen as the third important process of cosmic ray transport. In this paper, the recently derived weakly non-linear theory is applied for a simple quasi-magnetostatic composite model to determine the momentum diffusion coefficient. It is demonstrated that non-linear effects are essential and cannot be neglected. Therefore, the weakly non-linear transport theory has to be preferred over the traditional quasi-linear approach. Within this improved theory, we find for the rigidity dependence of the momentum diffusion coefficient A ~ R1.4 for relativistic and A ~ R0.4 for non-relativistic cosmic rays.

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