Arguments for fundamental emission by the parametric process L yields T + S in interplanetary type III bursts

Astronomy and Astrophysics – Astrophysics

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Electromagnetic Radiation, Ion Acoustic Waves, Plasma Radiation, Plasma Turbulence, Type 3 Bursts, Brightness Temperature, Electromagnetic Scattering, Frequency Ranges

Scientific paper

Observations of low frequency ion acoustic-like waves associated with Langmuir waves present during interplanetary Type 3 bursts are used to study plasma emission mechanisms and wave processes involving ion acoustic waves. It is shown that the observed wave frequency characteristics are consistent with the processes L yields T + S (where L = Langmuir waves, T = electromagnetic waves, S = ion acoustic waves) and L yields L' + S proceeding. The usual incoherent (random phase) version of the process L yields T + S cannot explain the observed wave production time scale. The clumpy nature of the observed Langmuir waves is vital to the theory of IP Type 3 bursts. The incoherent process L yields T + S may encounter difficulties explaining the observed Type 3 brightness temperatures when Langmuir wave clumps are incorporated into the theory. The parametric process L yields T + S may be the important emission process for the fundamental radiation of interplanetary Type 3 bursts.

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