Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981nyasa.375..297a&link_type=abstract
(AAS, American Physical Society, NASA, et al., Texas Symposium on Relativistic Astrophysics, 10th, Baltimore, MD, Dec. 15-19, 19
Astronomy and Astrophysics
Astrophysics
39
Cosmic Rays, Interstellar Matter, Particle Acceleration, Shock Wave Interaction, Supersonic Speed, Energy Transfer, Propagation Velocity, Shock Wave Propagation, Upstream, Wave Reflection
Scientific paper
The direct transfer of energy to cosmic rays from supersonic motions of the background medium via shock waves, by means of an efficient first order Fermi mechanism, is considered. The acceleration of cosmic rays by shock waves is most effective in the dilute and hot, 1,000,000-K component of the interstellar medium. There is no limit to the energy that can be achieved by shock acceleration, if enough time is available and the particles can be contained in the vicinity of the shock. The two basic first order Fermi mechanisms contributing to the overall process of shock acceleration of cosmic rays are reflection at, or transmission through, the magnetic field jump associated with the shock, and multiple reflection between the media upstream and downstream of the shock, due to the presence of waves that scatter the particles in pitch angle.
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