Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981plap.rept...89p&link_type=abstract
In ESA Plasma Astrophys. p 89-95 (SEE N82-20030 10-88)
Astronomy and Astrophysics
Astrophysics
Astrophysics, Coherent Electromagnetic Radiation, Plasma Pumping, Plasma Radiation, Electrostatic Waves, Free Electrons, Kilometric Waves, Nonlinearity, Radiation Sources, Relativistic Electron Beams
Scientific paper
The generation of electromagnetic radiation from the free energy available in electron streams is discussed. The fundamental principles involved in a particular class of coherent plasma radiation sources, i.e., plasma lasers, are reviewed, focusing on three wave coupling, nonlinear parametric instabilities, and negative energy waves. The simplest case of plasma lasers, that of an unmagnetized plasma containing a finite level of density fluctuations and electrons streaming with respect to the ions, is dealt with. A much more complicated application of plasma lasers to the case of auroral kilometric radiation is then examined. The concept of free electron lasers, including the role of relativistic scattering, is elucidated. Important problems involving the escape of the excited radiation from its generation region, effects due to plasma shielding and nonlinear limits, are brought out.
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