Computer Science – Sound
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2187c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 22, p. 2187-2190.
Computer Science
Sound
39
Electrostatic Waves, Frequency Modulation, Jupiter (Planet), Solar Planetary Interactions, Wave Packets, Bow Waves, Electron Beams, S Waves, Shock Waves
Scientific paper
Langmuir wave packets with low frequency modulations (or beats) observed in the Jovian foreshock are argued to be direct evidence for the Langmuir wave decay L yields L-prime + S. In this decay, 'pump' Langmuir waves L, driven by an electron beam, produce backscattered product Langmuir waves L-prime and ion sound waves S. The L and L-prime waves beat at the frequency and wavevector of the S waves, thereby modulating the wave packets. Beam speeds calculated using the modulated Jovian wave packets (1) are reasonable, at 4-10 times the electron thermal speed, (2) are consistent with theoretical limits on the decay process, and (3) decrease with increasing foreshock depth, as expected theoretically. These results strongly support the theory. The modulation depth of some wave packets suggests saturation by the decay L yields L-prime + S. Applications to modulated Langmuir packets in the Venusian and terrestrial foreshocks and in a type III radio source are proposed.
Cairns Iver H.
Robinson Adam P.
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