Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.321..433b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 321, Issue 3, pp. 433-438.
Astronomy and Astrophysics
Astronomy
210
Acceleration Of Particles, Magnetic Fields, Plasmas, Shock Waves, Turbulence, Cosmic Rays, Acceleration Of Particles, Magnetic Fields, Plasmas, Shock Waves, Turbulence, Cosmic Rays
Scientific paper
The maximum energy for cosmic ray acceleration at supernova shock fronts is usually thought to be limited to around 1014-1015eV by the size of the shock and the time for which it propagates at high velocity. We show that the magnetic field can be amplified non-linearly by the cosmic rays to many times the pre-shock value, thus increasing the acceleration rate and facilitating acceleration to energies well above 1015eV. A supernova remnant expanding into a uniform circumstellar medium may accelerate protons to 1017eV and heavy ions, with charge Ze, to Z×1017eV. Expansion into a pre-existing stellar wind may increase the maximum cosmic ray energy by a further factor of 10.
Bell Roger A.
Lucek S. G.
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