Clumpy Langmuir waves in type III radio sources

Details Clumpy Langmuir waves in type III radio sources Clumpy Langmuir waves in type III radio sources

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..139..147r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 139, no. 1, May 1992, p. 147-163. Research supported by Australian Research Council.

Physics

102

Electrostatic Waves, Solar Wind, Stellar Models, Type 3 Bursts, Electric Fields, Flow Stability, Particle Beams, Particle Density (Concentration)

Scientific paper

A model is developed which sheds light on the origin of clumped Langmuir waves in type III regions as well as their electric fields. Type III streams are argued to be in a state that nears marginal stability, and the clumps result from fluctuations about this state. The statistical distribution of fields and nonlinear and diffusive effects are examined in the context of Langmuir growth and damping rates. A strong anticorrelation is identified between high damping rates and high wave levels, and stochastic growth below saturation is described. The model is shown to adequately describe observed traits such as: (1) the clumpiness of the Langmuir waves; (2) the negative mean growth rate in type III sources; and (3) the decay time of type III electromagnetic emission. The discrepancies between predicted and observed wave-collapse times suggest that wave collapse is uncommon in type III sources at 1 AU.

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