The acceleration of cosmic rays in shock fronts – I

  title={The acceleration of cosmic rays in shock fronts – I},
  author={A R Bell},
  journal={Monthly Notices of the Royal Astronomical Society},
  • A. Bell
  • Published 1 February 1978
  • Physics
  • Monthly Notices of the Royal Astronomical Society
Shock waves in the large-scale structure of the Universe
Cosmological shock waves are induced during hierarchical formation of large-scale structure in the universe. Like most astrophysical shocks, they are collisionless, since they form in the tenuous
Evidence of 100 TeV gamma-ray emission from HESS J1702-420: a new PeVatron candidate
Aims. The identification of PeVatrons, hadronic particle accelerators reaching the knee of the cosmic ray spectrum (few× 1015 eV), is crucial to understand the origin of cosmic rays in the Galaxy. We
Evidence of 100 TeV γ-ray emission from HESS J1702-420: A new PeVatron candidate
The identification of active PeVatrons, hadronic particle accelerators reaching the knee of the cosmic-ray spectrum (at the energy of few PeV), is crucial to understand the origin of cosmic rays in
Fast Particle Acceleration at Perpendicular Shocks with Uniform Upstream Magnetic Field and Strong Downstream Turbulence
The shock waves produce relativistic particles via the diffusive shock acceleration (DSA) mechanism. Among various circumstances, fast acceleration has been expected for perpendicular shocks. We
Diffusive Shock Acceleration: Breakdown of Spatial Diffusion and Isotropy
We point out that particles accelerated in a non-relativistic shock of compression ratio $r$ attain the standard, $p=(r+2)/(r-1)$ spectral index only under certain conditions. Previous derivations of
Supernova explosions of massive stars and cosmic rays
Cosmic Rays and Non-thermal Emission Induced by Accretion of Cool Gas onto the Galactic Disk
On both observational and theoretical grounds, the disk of our Galaxy should be accreting cool gas with temperature ~<10^5 K via the halo at a rate ~1 M_sun/yr. At least some of this accretion is
Particle acceleration and transport in the inner heliosphere
  • Gang Li
  • Physics
    Science China Earth Sciences
  • 2017
In the solar system, our Sun is Nature’s most efficient particle accelerator. In large solar flares and fast coronal mass ejections (CMEs), protons and heavy ions can be accelerated to over
Why is solar cycle 24 an inefficient producer of high-energy particle events?
The aim of the study is to investigate the reason for the low productivity of high-energy SEPs in the present solar cycle. We employ scaling laws derived from diffusive shock acceleration theory and
On the contribution of a hard galactic plane component to the excesses of secondary particles
The standard model of cosmic ray propagation has been very successful in explaining all kinds of the Galactic cosmic ray spectra. However, high precision measurement recently revealed the appreciable