Coherent radiation from energetic electron streams via collisionless bremsstrahlung in strong plasma turbulence

Details Coherent radiation from energetic electron streams via collisionless bremsstrahlung in strong plasma turbulence Coherent radiation from energetic electron streams via collisionless bremsstrahlung in strong plasma turbulence

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378..543w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 10, 1991, p. 543-549. Research supported by General Dynamics Cor

Astronomy and Astrophysics

Astronomy

31

Bremsstrahlung, Coherent Radiation, Electron Beams, Plasma Radiation, Plasma Turbulence, Radio Jets (Astronomy), Electrostatics, Magnetohydrodynamic Stability, Plasma Frequencies, Synchrotron Radiation

Scientific paper

Radiation produced by the scattering of energetic electron streams in regions of plasma turbulence can be more efficient than synchrotron emission. Plasma instability occurs naturally due to counterstreaming plasmas in the environment of galactic jets, and saturates in a turbulent state of intense localized regions of electrostatic field. Energetic electrons accelerate while traversing soliton-like electric field structures. Their radiation is extremely broad-band in frequency, a bremsstrahlung type spectrum in which the minimum impact parameter is the scale size of the soliton, assumed to be a many Debye lengths. Radiation may extend many orders of magnitude higher in frequency than the plasma frequency, and is relativistically beamed. For a stream of electrons, the emission is partially coherent if the beam is bunched. A specific model for beam density fluctuation statistics yields a power-law radiation spectrum. Turbulent radiation in some parameter regimes can equal or exceed synchrotron emission. Such radiation may therefore significantly reduce the overall energy requirements for central engines of galactic radio sources.

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