Spectra of protons and nuclei in the energy range of $10^{10}÷10^{20}$ eV in the framework of Galactic cosmic ray origin

Abstract

We consider the problem of the cosmic ray spectrum formation assuming that cosmic rays are produced by Galactic sources. The anomalous diffusion equation proposed in our recent papers is used to describe cosmic ray propagation in the interstellar medium. We show that in the framework of this approach and with generation spectrum exponent $\gamma =2.85$ it is possible to reproduce locally observed basic features of cosmic rays in the energy region of $10^{10}÷10^{20}$ eV: difference between spectral exponents of protons and other nuclei, mass composition variation, `knee' problem, flattening of the primary spectrum at $E\ge 10^{18}÷10^{19}$ eV. The crucial model predictions for the mass composition behaviour in the ultra-high energy region are discussed.

7 pages, 4 figures, 24th European Cosmic Ray Symposium

References in corpus (3)

• Depth of Maximum of Air-Shower Profiles at the Pierre Auger Observatory: Measurements at Energies above 10^17.8 eV
• The Cosmic Ray Energy Spectrum Observed with the Surface Detector of the Telescope Array Experiment
• Energy spectrum and mass composition of primary cosmic rays around the `knee' in the framework of the model with two types of sources