Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...431..705s&link_type=abstract
The Astrophysical Journal, vol. 431, no. 2, pt. 1, p. 705-714
Astronomy and Astrophysics
Astrophysics
116
Galactic Cosmic Rays, Interstellar Matter, Magnetohydrodynamic Waves, Particle Acceleration, Plasma Turbulence, Wave Propagation, Cosmology, Energy Spectra, Galactic Nuclei, Spectrum Analysis, Stellar Spectra, Stochastic Processes, Transport Theory, Wave Scattering
Scientific paper
The effects of reacceleration on cosmic rays have been studied over a wide charge and energy range using a model of reacceleration by the interstellar turbulence. We take into account only inevitable stochastic reacceleration of cosmic rays by the random hydrodynamic waves, which supposedly exist in the interstellar medium and provide a means for cosmic-ray scattering and spatial diffusion in the Galaxy. Our calculations reproduce not only the B/C ratio but also the H and He data over the entire energy range where the measurements are available. However, the sub-Fe to Fe ratio is not fitted as well as the B/C ratio, and the reacceleration effect does not seem to remove the need for truncation of short path lengths, which is apparently required by the standard leaky box model. This work demonstrates that the cosmic-ray data can be represented at least as well by a reacceleration model with a simple rigidity power-law escape length, which agrees with the Kolmogorov-type spectrum of hydromagnetic turbulence, as they can by the standard leaky box model with its ad hoc escape lengths.
Ptuskin Vladimir S.
Seo Eun-Suk
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