Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aipc...56..329h&link_type=abstract
In: Particle acceleration mechanisms in astrophysics; Proceedings of the Workshop, La Jolla, Calif., January 3-5, 1979. (A80-532
Astronomy and Astrophysics
Astrophysics
1
Cosmic Rays, Magnetohydrodynamic Waves, Particle Acceleration, Plasma-Particle Interactions, Relativistic Particles, Flow Velocity, High Temperature Plasmas, Magnetohydrodynamic Turbulence, Pitch (Inclination)
Scientific paper
The pitch angle scattering of relativistic particles by self-generated hydromagnetic waves is discussed. It is shown that in a hot background plasma, because of the resonant damping of short wavelength waves by thermal protons, cosmic rays need not slow down to a mean streaming speed which is of order the Alfven speed. The effects of a high cosmic ray energy density upon the destabilized wave model are also discussed. Recent work indicates that when the cosmic ray energy density is on the order of or exceeds the energy density in the ambient magnetic field, the velocity of the amplified waves is significantly greater than the Alfven speed. These effects have important implications for recent cosmic ray acceleration models and are important for studies of particle propagation in many astrophysical plasmas.
Holman Gordon D.
Ionson James A.
Morrison Philip J.
Scott Joshua S.
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