TeV cosmic-ray proton and helium spectra in the myriad model

Abstract

Recent measurements of cosmic ray proton and helium spectra show a hardening above a few hundreds of GeV. This excess is hard to understand in the framework of the conventional models of Galactic cosmic ray production and propagation. We propose here to explain this anomaly by the presence of local sources (myriad model). Cosmic ray propagation is described as a diffusion process taking place inside a two-zone magnetic halo. We calculate the proton and helium fluxes at the Earth between 50 GeV and 100 TeV. Improving over a similar analysis, we consistently derive these fluxes by taking into account both local and remote sources for which a unique injection rate is assumed. We find cosmic ray propagation parameters compatible with B/C measurements and for which the proton and helium spectra remarkably agree with the PAMELA and CREAM measurements over four decades in energy.

5 pages, 3 figures

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• Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station
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• The Connection Between the Positron Fraction Anomaly and the Spectral Features in Galactic Cosmic-Ray Hadrons
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• Cosmic-Ray Hardenings in the Light of AMS-02
• Stable laws and cosmic ray physics
• Galactic cosmic-ray model in the light of AMS-02 nuclei data
• Implications on the origin of cosmic rays in light of 10 TV spectral softenings
• Systematic study of the uncertainties in fitting the cosmic positron data by AMS-02
• Antiproton Limits on Decaying Gravitino Dark Matter
• Measurement of the Iron Spectrum in Cosmic Rays by VERITAS
• Direct Measurement of the Nickel Spectrum in Cosmic Rays in the Energy Range from 8.8 GeV/n to 240 GeV/n with CALET on the International Space Station
• Testing universality of cosmic-ray acceleration with proton/helium data from AMS and Voyager-1
• Origin of the spectral upturn in the cosmic-ray C/Fe and O/Fe ratios
• Bayesian analysis of the hardening in AMS-02 nuclei spectra
• TeV cosmic-ray proton and helium spectra in the myriad model II
• Evidence of fresh cosmic ray in galactic plane based on DAMPE measurement of B/C and B/O ratios
• Origin of hardening in spectra of cosmic ray nuclei at a few hundred GeV using AMS-02 data
• Some new hints on cosmic-ray propagation from AMS-02 nuclei spectra
• Origin of hardening and universality of cosmic rays spectra in GV-PV rigidity region
• The proton and helium anomalies in the light of the Myriad model