The maximum energy of cosmic rays accelerated by supernova shocks

Details The maximum energy of cosmic rays accelerated by supernova shocks The maximum energy of cosmic rays accelerated by supernova shocks

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125..249l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 2, Sept. 1983, p. 249-257.

Astronomy and Astrophysics

Astrophysics

281

Cosmic Rays, Particle Acceleration, Particle Energy, Shock Wave Propagation, Supernovae, Diffusion Coefficient, Magnetohydrodynamic Waves, Milky Way Galaxy, Particle Diffusion

Scientific paper

An attempt is made to evaluate the maximum energy, E(max), that particles subjected to the diffusive shock acceleration process can acquire during an SNR's lifetime. The rate of acceleration depends on the particle diffusion coefficient, which is determined by the level of hydromagnetic wave energy present at a scale that is comparable to the particle Larmor radius. Attention is given to diffusion coefficient variations as a function of momentum, space, and time. Given a realistic diffusion coefficient behavior value, an E(max) of less than about 10,000 GeV/n is obtained, signifying that supernova shock acceleration cannot account for the observed spectrum of galactic cosmic rays in the 1-1,000,000 GeV/n energy range.

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