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Nonlinear evolution of high frequency R-mode waves excited by water group ions near comets - Computer experimentsAn 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.
Document ID
19890039257
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kojima, H.
(Kyoto Univ. Uji, Japan)
Matsumoto, H.
(Kyoto Univ. Uji, Japan)
Omura, Y.
(Kyoto University Uji, Japan)
Tsurutani, B. T.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena; Kyoto University Uji, Japan)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Geophysical Research Letters
Volume: 16
ISSN: 0094-8276
Subject Category
Astrophysics
Accession Number
89A26628
Distribution Limits
Public
Copyright
Other

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