Abstract
Cosmic rays do not stream freely through the galaxy, contrary to earlier expectations. Streaming cosmic rays are slowed down by the emission of resonant Alfven waves that scatter the cosmic rays. The theory of self-confinement explains the isotrqoy of the bulk of the cosmic rays but not of cosmic rays above 103 Gev; it has been a stimulus to the theory for cosmic-ray acceleration at supernova shocks; and, on inclusion of diffusion in a galactic wind, it may explain the uniform cosmic-ray density out to 18 kpc in our galaxy. Rapidly streaming electrons in clusters of galaxies, in supernova remnants, and near solar flares are accomodated by the theory when it is expanded to include the effects of hot plasmas and other wave modes. A “resonance gap” may prevent the turning backwards of streaming particles and thus allow streaming near the particle speed.
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Wentzel, D.G. (1985). Self-Confined Cosmic Rays. In: Kundu, M.R., Holman, G.D. (eds) Unstable Current Systems and Plasma Instabilities in Astrophysics. International Astronomical Union / Union Astronomique Internationale, vol 107. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6520-1_35
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