Parametric interaction and spatial collapse of beam-driven Langmuir waves in the solar wind

Details Parametric interaction and spatial collapse of beam-driven Langmuir waves in the solar wind Parametric interaction and spatial collapse of beam-driven Langmuir waves in the solar wind

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8833g&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8833-8841. Navy-supported research

Physics

75

Bow Waves, Electron Beams, Electrostatic Waves, Plasma Decay, Plasma-Particle Interactions, Solar Wind, Wave Attenuation, Doppler Effect, Flyby Missions, Frequency Shift, Jupiter (Planet), Shock Wave Propagation, Solitary Waves, Voyager Project, Wave Degradation, Wavelengths, Jupiter, Waves, Solar Wind, Electrons, Bow Shock, Wavelengths, Bursts, Resonance, Interactions, Emissions, Turbulence, Amplitude, Magnitude, Electric Fields, Structure, Doppler Shift, Frequencies, Parameters, Data, Observations, Intens

Scientific paper

Observations are presented of the parametric decay and spatial collapse of Langmuir waves driven by an electron beam streaming into the solar wind from the Jovian bow shock. Long wavelength Langmuir waves upstream of the bow shock are effectively converted into short wavelength waves no longer in resonance with the beam. The conversion is shown to be the result of a nonlinear interaction involving the beam-driven pump, a sideband emission, and a low level of ion-acoustic turbulence. The beam-driven Langmuir wave emission breaks up into a complex sideband structure with both positive and negative Doppler shifts. In some cases, the sideband emission consists of isolated wave packets with very short duration bursts, which are very intense and are thought to consist of envelope solitons which have collapsed to spatial scales of only a few Debye lengths.

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