"Cosmic ray origin: current status of the problem"
E.G. Berezhko (Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy)
Abstract:
Cosmic
ray (CR) origin problem is considered. CR acceleration (generation) at the
shocks, produced by supernova explosions, and the properties of nonthermal
emission generated by CRs accelerated in supernova remnants are detaily
discussed. It is shown that calculations performed within nonlinear
kinetic theory reasonably well explain the observed properties of
nonthermal emission from supernova remnants that has to be considered as
the evidence of efficient CR production in supernova remnants accompanied
by considerable magnetic field amplification. Due to magnetic field
amplification CR acceleration in supernova remnants provide the formation
of the observed galactic CR spectrum up to the energy 10**17 eV. Possible
scenarios of the formation of CR spectrum at energies above 10**17 eV are
briefly discussed.
.