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Parametric instabilities of a large-amplitude circularly polarized Alfven wave - Linear growth in two-dimensional geometriesThe growth of parametric instabilities, which may lead to the development of a turbulent cascade, is studied using an MHD code that permits nonlinear couplings in the parallel direction to the ambient magnetic field and one perpendicular direction. Compressibility is included in the form of a polytropic equation of state. Parametric instabilities associated with a parallel-propagating decay instability are found to dominate the low-beta case. An obliquely propagating filamentationlike instability dominates the high-beta case. The nonlinear growth of the nth harmonic of a daughter wave growing as a factor of n times the fundamental's growth rate is found in both cases. Nonlinear saturation is caused by the parallel decay instability in the low-beta case and by the oblique filamentationlike instability in the high-beta case.
Document ID
19940033538
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ghosh, S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Vinas, A. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Goldstein, M. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
September 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A9
ISSN: 0148-0227
Subject Category
Plasma Physics
Accession Number
94A10193
Distribution Limits
Public
Copyright
Other

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