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High frequency ion sound waves associated with Langmuir waves in type III radio burst source regions

MacDowall, R. J.; Thejappa, G.

Short wavelength ion sound waves (2-4kHz) are detected in association with the Langmuir waves (~15-30kHz) in the source regions of several local type III radio bursts. They are most probably not due to any resonant wave-wave interactions such as the electrostatic decay instability because their wavelengths are much shorter than those of Langmuir w…