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American Astronomical Society, Astrophysical Journal, 2(642), p. 902-916, 2006

DOI: 10.1086/501117

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Dissipation of Magnetohydrodynamic Waves on Energetic Particles: Impact on Interstellar Turbulence and Cosmic Ray Transport

Journal article published in 2006 by Igor V. Moskalenko, Vladimir S.; /Troitsk IZMIRAN /Maryland U.;Moskalenko Igor V.; /Stanford U. HEPL;Jones F. C.; /NASA Goddard;Strong A. W.; /Garching Max Planck Inst MPE; Zirakashvili V. N.; /Troitsk IZMIRAN /Heidelberg Astron.; Ptuskin, Frank C. Jones, Andrew W. Strong, Vladimir N. Zirakashvili
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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{sup 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.