Stochastic Fluctuations of Low-Energy Cosmic Rays and the Interpretation of Voyager Data.

@article{Phan2021StochasticFO,
  title={Stochastic Fluctuations of Low-Energy Cosmic Rays and the Interpretation of Voyager Data.},
  author={Vo Hong Minh Phan and Florian Schulze and Philipp Mertsch and Sarah Recchia and Stefano Gabici},
  journal={Physical review letters},
  year={2021},
  volume={127 14},
  pages={
          141101
        }
}
Data from the Voyager probes have provided us with the first measurement of cosmic ray intensities at MeV energies, an energy range that had previously not been explored. Simple extrapolations of models that fit data at GeV energies, e.g., from AMS-02, however, fail to reproduce the Voyager data in that the predicted intensities are too high. Oftentimes, this discrepancy is addressed by adding a break to the source spectrum or the diffusion coefficient in an ad hoc fashion, with a convincing… 

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References

SHOWING 1-10 OF 83 REFERENCES
Cosmic ray electrons and positrons from discrete stochastic sources
The distances that galactic cosmic ray electrons and positrons can travel are severely limited by energy losses to at most a few kiloparsec, thereby rendering the local spectrum very sensitive to the
Stochastic cosmic ray sources and the TeV break in the all-electron spectrum
  • P. Mertsch
  • Physics
    Journal of Cosmology and Astroparticle Physics
  • 2018
Despite significant progress over more than 100 years, no accelerator has been unambiguously identified as the source of the locally measured flux of cosmic rays. High-energy electrons and positrons
Variance of the Galactic nuclei cosmic ray flux
Context. Measurements of cosmic ray fluxes with the PAMELA and CREAM experiments show unexpected spectral features between 200 GeV and 100 TeV. They might be caused by nearby and young cosmic ray
Imprints of cosmic rays in multifrequency observations of the interstellar emission
Ever since the discovery of Cosmic Rays (CRs), significant advancements have been made in modeling their propagation in the Galaxy and in the Heliosphere. However, propagation models suffer from
Can a cosmic ray carrot explain the ionization level in diffuse molecular clouds?
Low energy cosmic rays are the major ionization agents of molecular clouds. However, it has been shown that, if the cosmic ray spectrum measured by Voyager 1 is representative of the whole Galaxy,
HelMod in the Works: From Direct Observations to the Local Interstellar Spectrum of Cosmic-Ray Electrons.
The local interstellar spectrum (LIS) of cosmic-ray (CR) electrons for the energy range 1 MeV to 1 TeV is derived using the most recent experimental results combined with the state-of-the-art models
New Very Local Interstellar Spectra for Electrons, Positrons, Protons, and Light Cosmic Ray Nuclei
The local interstellar spectra (LIS's) for galactic cosmic rays (CR's) cannot be directly observed at the Earth below certain energies, because of solar modulation in the heliosphere. With Voyager 1
Propagation of Cosmic-Ray Nucleons in the Galaxy
We describe a method for the numerical computation of the propagation of primary and secondary nucleons, primary electrons, and secondary positrons and electrons. Fragmentation and energy losses are
Diffusive propagation of cosmic rays from supernova remnants in the Galaxy. I: spectrum and chemical composition
In this paper we investigate the effect of stochasticity in the spatial and temporal distribution of supernova remnants on the spectrum and chemical composition of cosmic rays observed at Earth. The
Constraining the cosmic ray spectrum in the vicinity of the supernova remnant W28: from sub-GeV to multi-TeV energies
Context. Supernova remnants interacting with molecular clouds are ideal laboratories to study the acceleration of particles at shock waves and their transport and interactions in the surrounding
...
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4
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