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Evidence for nonlinear wave-wave interactions in solar type III radio bursts
Lin, R. P.; Levedahl, W. K.; Lotko, W.; Gurnett, D. A.; Scarf, F. L.
AA(California, University, Berkeley), AB(California, University, Berkeley), AC(Dartmouth College, Hanover, NH), AD(Iowa, University, Iowa City), AE(TRW, Inc., Redondo Beach, CA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. 954-965. (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Electrostatic Waves, Ion Acoustic Waves, Solar Radio Bursts, Type 3 Bursts, Wave Interaction, Astronomical Spectroscopy, International Sun Earth Explorer 3, Interplanetary Medium, Solar Physics, Solar Wind
Bibliographic Code:


Evidence is presented that nonlinear wave-wave interactions occur in type III solar radio bursts. Intense, spiky Langmuir waves are observed to be driven by electron beams associated with type III solar radio bursts in the interplanetary medium. Bursts of 30-300 Hz (in the spacecraft frame) waves are often observed coincident in time with the most intense spikes of the Langmuir waves. These low-frequency waves appear to be long-wavelength ion acoustic waves, with wavenumber approximately equal to the beam resonant Langmuir wavenumber. Three possible interpretations of these observations are considered: modulational instability, parametric decay of the parent Langmuir waves to daughter ion acoustic and Langmuir waves, and decay to daughter electromagnetic waves and ion acoustic waves.

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