Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-11
Astrophys.J.642:902-916,2006
Astronomy and Astrophysics
Astrophysics
15 pages, 20 figures, 1 table, emulateapj.cls; To be published in ApJ 10 May 2006, v.642
Scientific paper
10.1086/501117
The physical processes involved in diffusion of Galactic cosmic rays in the interstellar medium are addressed. We study the possibility that the nonlinear MHD cascade sets the power-law spectrum of turbulence which scatters charged energetic particles. We find that the dissipation of waves due to the resonant interaction with cosmic ray particles may terminate the Kraichnan-type cascade below wavelengths 10^13 cm. The effect of this wave dissipation has been incorporated in the GALPROP numerical propagation code in order to asses the impact on measurable astrophysical data. The energy-dependence of the cosmic-ray diffusion coefficient found in the resulting self-consistent model may explain the peaks in the secondary to primary nuclei ratios observed at about 1 GeV/nucleon.
Jones Frank C.
Moskalenko Igor V.
Ptuskin Vladimir S.
Strong Andrew W.
Zirakashvili Vladimir N.
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