Turbulent diffusion and drift in galactic magnetic fields and the explanation of the knee in the cosmic ray spectrum

Details Turbulent diffusion and drift in galactic magnetic fields and the explanation of the knee in the cosmic ray spectrum Turbulent diffusion and drift in galactic magnetic fields and the explanation of the knee in the cosmic ray spectrum

2002-06-19

arxiv.org/abs/astro-ph/0206336v3

JHEP 0212 (2002) 033

Astronomy and Astrophysics

Astrophysics

17 pp., 6 figures; revised version with minor changes. To appear in JHEP

Scientific paper

10.1088/1126-6708/2002/12/033

We reconsider the scenario in which the knee in the cosmic ray spectrum is explained as due to a change in the escape mechanism of cosmic rays from the Galaxy from one dominated by transverse diffusion to one dominated by drifts. We solve the diffusion equations adopting realistic galactic field models and using diffusion coefficients appropriate for strong turbulence (with a Kolmogorov spectrum of fluctuations) and consistent with the assumed magnetic fields. We show that properly taking into account these effects leads to a natural explanation of the knee in the spectrum, and a transition towards a heavier composition above the knee is predicted.

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