Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.325...99s&link_type=abstract
Astrophysics and Space Science, Volume 325, Issue 1, pp.99-111
Astronomy and Astrophysics
Astrophysics
17
Cosmic Rays, Perpendicular Diffusion, Shock Acceleration
Scientific paper
We investigate cosmic ray scattering in the direction perpendicular to a mean magnetic field. Unlike in previous articles we employ a general form of the turbulence wave spectrum with arbitrary behavior in the energy range. By employing an improved version of the nonlinear guiding center theory we compute analytically the perpendicular mean free path. As shown, the energy range spectral index, has a strong influence on the perpendicular diffusion coefficient. If this parameter is larger than one we find for some cases a perpendicular diffusion coefficient that is independent of the parallel mean free path and particle energy. Two applications are considered, namely transport of Galactic protons in the solar system and diffusive particle acceleration at highly perpendicular interplanetary shock waves.
Li Gaojun
Shalchi Andreas
Zank Gary P.
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