منابع مشابه
Saturation of the magnetorotational instability
An analytical theory is developed that describes asymptotically exactly the process of nonlinear saturation of the magnetorotational instability in a model problem employing a linear shear flow in a uniformly rotating channel. The theory shows that the instability saturates by modifying the shear responsible for it. The saturation process requires both viscous and Ohmic dissipation. The theory ...
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An analysis of low order mode coupling equations is used to describe the nonlinear behavior of the RayleighTaylor (RT) instability in the equatorial ionosphere. The nonlinear evolution of RT instability leads to the development of shear flow. It is found that there is an interplay between the nonlinearity and the shear flow which compete with each other and saturate the RT mode, both in the col...
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The Farley-Buneman instability is a collisional two-stream instability observed in the E-region ionosphere at altitudes in the range 90-120km. While linear theory predicts the dominant wavelengths, it cannot fully describe the behavior of this nonlinearly saturated instability as observed by radar and rocket measurements. This paper explores the nonlinear behavior of this phenomenon and the res...
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Simulations of the magnetorotational instability (MRI) in a homogeneous shearing box have shown that the asymptotic strength of the magnetic field declines steeply with increasing resolution. Here I model the MRI driven dynamo as a large scale dynamo driven by the vertical magnetic helicity flux. This growth is balanced by large scale mixing driven by a secondary instability. The saturated magn...
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Fast Ion Instability is studied in the nonlinear regime. It is shown that exponential growth of the linear regime is replaced in this case by the linear dependence on time. Numeric and analytical results are presented describing the beam profile and the beam spectrum in both regimes. The full version of the paper contributed to PAC 1997, Vancouverj Canada May 2May 6, 1997 *Work supported by Dep...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2008
ISSN: 0094-8276
DOI: 10.1029/2008gl033907