Other
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phrvl..39..277b&link_type=abstract
Physical Review Letters, vol. 39, Aug. 1, 1977, p. 277-280.
Other
4
Collisionless Plasmas, Plasma Waves, Plasma-Electromagnetic Interaction, Propagation Modes, Wave Generation, Whistlers, Auroral Zones, Decay Rates, Dipole Antennas, Group Velocity, Ionospheric Noise, Noise Generators, Wave Attenuation, Wave Interaction
Scientific paper
Experimental and theoretical results are presented which show that a large-amplitude Bernstein wave may decay parametrically into another Bernstein wave and a whistler-mode wave. In the experiment a simple wire antenna was aligned parallel to the ambient magnetic field in a chamber containing a collisional RF plasma, allowing the Bernstein waves to propagate obliquely and thereby enabling the specific decay process to occur. The observed decay is identified as a three-wave process involving two Bernstein waves and a whistler-mode wave, and a theory is outlined which is in general agreement with observed properties of the decay process. It is concluded that the decay process is most likely to occur when the group velocity of the Bernstein wave is parallel to the group-velocity resonance cone of the whistler-mode wave and that this process is probably the dominant mechanism for the production of the whistler-mode noise measured in the auroral ionosphere.
Boswell Rod W.
Giles Misty M.
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