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

Julián Candia | Zendy; Esteban Roulet | Zendy; L.N. Epele | Zendy

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

Author(s) -

Julián Candia,

Esteban Roulet,

L.N. Epele

Publication year - 2002

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2002/12/033

Subject(s) - cosmic ray , physics , galaxy , diffusion , turbulence , magnetic field , astrophysics , cosmic cancer database , spectrum (functional analysis) , transverse plane , turbulent diffusion , ultra high energy cosmic ray , field (mathematics) , computational physics , mechanics , quantum mechanics , mathematics , structural engineering , pure mathematics , engineering

We reconsider the scenario in which the knee in the cosmic ray spectrum isexplained as due to a change in the escape mechanism of cosmic rays from theGalaxy from one dominated by transverse diffusion to one dominated by drifts.We solve the diffusion equations adopting realistic galactic field models andusing diffusion coefficients appropriate for strong turbulence (with aKolmogorov spectrum of fluctuations) and consistent with the assumed magneticfields. We show that properly taking into account these effects leads to anatural explanation of the knee in the spectrum, and a transition towards aheavier composition above the knee is predicted.Comment: 17 pp., 6 figures; revised version with minor changes. To appear in JHE

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