Beat-type Langmuir wave emissions associated with a type III solar radio burst: Evidence of parametric decay

Details Beat-type Langmuir wave emissions associated with a type III solar radio burst: Evidence of parametric decay Beat-type Langmuir wave emissions associated with a type III solar radio burst: Evidence of parametric decay

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1161h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 10, p. 1161-1164

Computer Science

Sound

22

Beat Frequencies, Decay Rates, Electrostatic Waves, Ionic Waves, Low Frequencies, Type 3 Bursts, Electron Beams, Fine Structure, Galileo Project, Solar Flares, Spectrum Analysis, Wave Propagation

Scientific paper

Recent measurements from the plasma wave instrument on the Galileo spacecraft have shown that Langmuir waves observed in conjunction with a type III solar radio burst contain many beat-type waveforms, with beat frequencies ranging from about 150 to 650 Hz. Strong evidence exists that the beat pattern is produced by two closely spaced narrowband components. The most likely candidates for these two waves are a beam-generated Langmuir wave and an oppositely propagating Langmuir wave produced by parametric decay. In the parametric decay process, nonlinear interactions cause the beam-driven Langmuir wave to decay into a Langmuir wave and a low-frequency ion sound wave. Comparisons of the observed beat frequency are in good agreement with theoretical predictions for a three-wave parametric decay process. Weak low-frequency emissions are also sometimes observed at the predicted frequency of the ion sound wave.

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