Nonlinear evolution of high frequency R-mode waves excited by water group ions near comets - Computer experiments

Details Nonlinear evolution of high frequency R-mode waves excited by water group ions near comets - Computer experiments Nonlinear evolution of high frequency R-mode waves excited by water group ions near comets - Computer experiments

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16....9k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Jan. 1989, p. 9-12.

Computer Science

Sound

8

Comets, Electrostatic Waves, Ion Beams, Nonlinear Evolution Equations, Wave Interaction, Background Radiation, Computerized Simulation, Magnetohydrodynamic Stability, Wave Excitation, Comets, Evolution, Ions, Computer Methods, Experiments, Frequencies, Waves, Simulations, Stability, Particles, Interactions, Giacobini-Zinner

Scientific paper

An ion beam resonates with R-mode waves at a high-frequency RH mode and a low-frequency RL mode. The nonlinear evolution of ion beam-generated RH waves is studied here by one-dimensional hybrid computer experiments. Both wave-particle and subsequent wave-wave interactions are examined. The competing process among coexisting RH and RL mode beam instabilities and repeated decay instabilities triggered by the beam-excited RH mode waves is clarified. It is found that the quenching of the RH instability is not caused by a thermal spreading of the ion beam, but by the nonlinear wave-wave coupling process. The growing RH waves become unstable against the decay instability. This instability involves a backward-traveling RH electromagnetic wave and a forward-traveling longitudinal sound wave. The inverse cascading process is found to occur faster than the growth of the RL mode. Wave spectra decaying from the RH waves weaken as time elapses and the RL mode waves become dominant at the end of the computer experiment.

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