Spectra of protons and nuclei in the energy range of 1010 ÷ 1020 eV in the framework of Galactic cosmic ray origin

24th European Cosmic Ray Symposium

Volkov, Nikolay^1 ; Lagutin, Anatoly^1 ; Tyumentsev, Alexander^1 ; Raikin, Roman^1

Altai State University, Radiophysics and Theoretical Physics Department, 61 Lenin ave., Barnaul

656049, Russia^1

关键词: Anomalous diffusion equations;    Cosmic ray propagation;    Cosmic ray spectra;    Galactic cosmic rays;    Interstellar mediums;    Mass composition;    Model prediction;    Ultra-high energies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/632/1/012028/pdf
DOI  :  10.1088/1742-6596/632/1/012028

来源: IOP

【 摘 要 】

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 γ = 2.85 it is possible to reproduce locally observed basic features of cosmic rays in the energy region of 1010÷ 1020eV: difference between spectral exponents of protons and other nuclei, mass composition variation, "knee" problem, flattening of the primary spectrum at E ≥ 1018÷ 1019eV. The crucial model predictions for the mass composition behaviour in the ultra-high energy region are discussed.