Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..273s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. 273-278.
Astronomy and Astrophysics
Astronomy
22
Electron Acceleration, Magnetohydrodynamic Waves, Magnetoplasmadynamics, Radio Astronomy, Relativistic Electron Beams, Space Plasmas, Extragalactic Radio Sources, Magnetohydrodynamic Stability, Plasma-Particle Interactions, Relaxation Time, Solitary Waves, Wave Propagation
Scientific paper
The generation of Alfven waves by magnetic field-aligned electron streams, and the evolution of such streams under the action of the self-generated waves, remains an important question in theoretical radio astronomy. In this paper a simple derivation is presented of a time scale on which a nonlinear Alfven wave packet collapses. This time scale is compared with the linear growth and quasi-linear relaxation time scales for conditions appropriate to an extragalactic radio source. The nonlinear time scale can be comparable to the linear and quasi-linear time scales, which suggests that nonlinear effects may stabilize this instability and permit the propagation of anisotropic electron streams.
Sheerin J. P.
Spangler Steven R.
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