Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.258..687s&link_type=abstract
Nature, vol. 258, Dec. 25, 1975, p. 687, 688.
Astronomy and Astrophysics
Astronomy
6
Cosmic Rays, Interstellar Radiation, Magnetohydrodynamic Waves, Particle Diffusion, Trapped Particles, Astronomical Models, Magnetoacoustic Waves, Plasma-Particle Interactions, Wave Generation
Scientific paper
Taking the confinement mechanism for cosmic rays in the Galaxy to be resonant scattering by Alfven or hydromagnetic waves generated by streaming of the cosmic rays themselves, it is shown that the abundant low-energy cosmic rays can indirectly generate enough long-wavelength Alfven waves to scatter cosmic rays of considerably higher energy. It is noted that cosmic rays with energies up to about 1000 GeV may thus be confined within the Galaxy more efficiently than has previously been supposed. Two steady-state equations are derived which govern the cascade of stimulated decay processes that remove the generated Alfven waves, and it is shown that these equations determine the Alfven-wave intensities appropriate to a given spectrum of cosmic rays. Boundary conditions necessary for solving the equations are stipulated, and the total wave intensity, dominated by its constant of integration, is determined for typical parameters of the ionized interstellar medium. It is concluded that the resulting high-intensity waves give good confinement of cosmic rays having energies as high as 1000 GeV.
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