搜索结果: 1-15 共查到“地球物理学 instability”相关记录19条 . 查询时间(0.022 秒)
Breakdown of chiral symmetry during saturation of the Tayler instability
Breakdown of chiral symmetry saturation of the Tayler instability Fluid Dynamics
2012/4/19
We study spontaneous breakdown of chiral symmetry during the nonlinear evolution of the Tayler instability. We start with an initial stationary state of zero helicity. Within linearized perturbation c...
Evolution of unsteady jets in the Rayleigh-Taylor instability
unsteady jets Rayleigh-Taylor instability
2009/11/13
The paper concerns the temporal evolution of the Rayleigh-Taylor instability of two superimposed fluids in a vertical channel. At large times the instability results in the formation of a wide nearly-...
On a nonlinear state of the electromagnetic ion/ion cyclotron instability
nonlinear state electromagnetic ion/ion cyclotron instability
2009/11/13
We have investigated the nonlinear properties of the electromagnetic ion/ion cyclotron instability (EMIIC) by means of hybrid simulations (macroparticle ions, massless electron fluid). The instability...
Three-dimensional simulation of the electromagnetic ion/ion beam instability:cross field diffusion
Three-dimensional simulation electromagnetic ion/ion beam instability cross field diffusion
2009/11/13
In a system with at least one ignorable spatial dimension charged particles moving in fluctuating fields are tied to the magnetic field lines. Thus, in one-and two-dimensional simulations cross-field ...
Nonlinear saturation of Rayleigh-Taylor instability and generation of shear flow in equatorial spread-F plasma
Nonlinear saturation Rayleigh-Taylor instability shear flow equatorial spread-F plasma
2009/11/12
An analysis of low order mode coupling equations is used to describe the nonlinear behaviour of the Rayleigh-Taylor (RT) instability in the equatorial ionosphere. The nonlinear evolution of RT instabi...
Nonlinear evolution of the parametric instability:numerical predictions versus observations in the heliosphere
Nonlinear evolution parametric instability numerical predictions versus observations
2009/11/12
Low-frequency turbulence in the solar wind is characterized by a high degree of Alfvénicity close to the Sun. Cross-helicity, which is a measure of Alfvénic correlation, tends to decrease with increas...
Baroclinic instability of a symmetric,rotating,stratified flow:a study of the nonlinear stabilisation mechanisms in the presence of viscosity
Baroclinic instability nonlinear stabilisation mechanisms presence of viscosity
2009/11/12
This paper presents the analysis of symmetric circulations of a rotating baroclinic flow, forced by a steady thermal wind and dissipated by Laplacian friction. The analysis is performed with numerical...
On the predominance of oblique disturbances in the supersonic shear flow instability of the geomagnetic tail boundary
oblique disturbances supersonic shear flow instability geomagnetic tail boundary
2009/11/12
A study is made of the influence of the longitudinal magnetic field and density inhomogeneity on the supersonic shear flow instability at the magnetospheric tail boundary. It is shown that the most un...
Instability patterns between counter-rotating disks
Instability patterns counter-rotating disks
2009/11/12
The instability patterns in the flow between counter-rotating disks (radius to height ratio R/h from 3.8 to 20.9) are investigated experimentally by means of visualization and Particle Image Velocimet...
Nonlinear instability of baroclinic atmosphere with reference to planetary scale disturbances
Nonlinear instability baroclinic atmosphere planetary scale disturbances
2009/11/11
In this paper we investigate the stability of zonal flow in a baroclinic atmosphere with respect to finite-amplitude planetary-scale disturbances by applying Arnold's method. Specifically, we examine ...
Hysteresis-controlled instability waves in a scale-free driven current sheet model
Hysteresis-controlled instability waves scale-free driven current sheet model
2009/11/11
Magnetospheric dynamics is a complex multiscale process whose statistical features can be successfully reproduced using high-dimensional numerical transport models exhibiting the phenomenon of self-or...
Topographic instability of flow in a rotating fluid
Topographic instability of flow rotating fluid
2009/11/9
Here are presented the results of experimental and theoretical studies on a stability of zonal geostrophic flows in the rotating layer of the shallow water. In the experiments, a special apparatus by ...
Synchronization and chaos control in a periodically forced quasi-geostrophic two-layer model of baroclinic instability
Synchronization chaos control quasi-geostrophic two-layer model baroclinic instability
2009/11/9
Cyclic forcing on many timescales is believed to have a significant effect on various quasi-periodic, geophysical phenomena such as El Niño, the Quasi-Biennial Oscillation, and glacial cycles. ...
Nonlinear instability and sensitivity of a theoretical grassland ecosystem to finite-amplitude perturbations
Nonlinear instability theoretical grassland ecosystem finite-amplitude perturbations
2009/11/3
Within a theoretical model context, the sensitivity and instability of the grassland ecosystem to finite-amplitude perturbations are studied. A new approach of conditional nonlinear optimal perturbati...
Magnetic holes in plasmas close to the mirror instability
Magnetic holes plasmas close mirror instability
2009/11/3
Non-propagating magnetic hole solutions in anisotropic plasmas near the mirror instability threshold are investigated in numerical simulations of a fluid model that incorporates linear Landau damping ...