搜索结果: 1-14 共查到“地球物理学 instabilities”相关记录14条 . 查询时间(0.098 秒)
Ion thermal effects on E-region instabilities: 2D kinetic simulations
E-region electrojet Ionospheric irregularities Plasma instabilities
2017/3/22
Radars frequently receive strong returns from naturally occurring plasma density irregularities centered around
100 km altitude in the atmosphere. These E-region ionospheric irregularities occur when...
Plasma instabilities in meteor trails: 2-D simulation studies
2-D simulation studies Plasma instabilities
2017/3/22
Field-aligned plasma density irregularities detected as nonspecular echoes by radars
with large aperture-power products indicate the presence of plasma turbulence within
meteor trails. This paper pr...
Reactive-infiltration instabilities in rocks. Fracture dissolution
Reactive-infiltration instabilities rocks Fracture dissolution Fluid Dynamics
2012/4/19
A reactive fluid dissolving the surface of a uniform fracture will trigger an instability in the dissolution front, leading to spontaneous formation of pronounced well-spaced channels in the surroundi...
On the connection between the magneto-elliptic and magneto-rotational instabilities
On the connection magneto-elliptic magneto-rotational instabilities
2012/2/23
It has been recently suggested that the magneto-rotational instability (MRI) is a limiting case of the magneto-elliptic instability (MEI). This limit is obtained for horizontal modes in the presence o...
Bifurcations and instabilities in rotating two-layer fluids:I.f-plane
Bifurcations instabilities two-layer fluids I.f-plane
2009/11/12
In this paper, we show that the behaviour of weakly nonlinear waves in a 2-layer model of baroclinic instability on an f-plane with varying viscosity is determined by a single, degenerate codimension ...
Bifurcations and instabilities in rotating,two-layer fluids:II. β-plane
Bifurcations instabilities two-layer fluids β-plane
2009/11/12
In this paper, we show that the behavior of weakly nonlinear waves in a 2-layer model of baroclinic instability on a b-plane with varying viscosity is determined by a single, degenerate codimension th...
Low-frequency linear waves and instabilities in uniform and stratified plasmas:the role of kinetic effects
Low-frequency linear waves uniform and stratified plasmas kinetic effects
2009/11/11
We review the basic approximations underlying magnetohydrodynamic (MHD) theory, with special emphasis on the closure approximations, i.e. the approximations used in any fluid approach to close the hie...
Landau-fluid simulations of Alfvén-wave instabilities in a warm collisionless plasma
Landau-fluid simulations Alfvén-wave instabilities warm collisionless plasma
2009/11/11
A dispersive Landau-fluid model is used to study the decay and modulational instabilities of circularly-polarized Alfvén waves in a collisionless plasma, as well as their nonlinear developments. Compa...
Remarks on nonlinear relation among phases and frequencies in modulational instabilities of parallel propagating Alfvén waves
nonlinear relation modulational instabilities parallel propagating Alfvén waves
2009/11/9
Nonlinear relations among frequencies and phases in modulational instability of circularly polarized Alfvén waves are discussed, within the context of one dimensional, dissipation-less, unforced fluid...
On MHD waves,fire-hose and mirror instabilities in anisotropic plasmas
MHD waves fire-hose mirror instabilities anisotropic plasmas
2009/11/3
Temperature or pressure anisotropies are characteristic of space plasmas, standard magnetohydrodynamic (MHD) model for describing large-scale plasma phenomena however usually assumes isotropic pressur...
Controlling instabilities along a 3DVar analysis cycle by assimilating in the unstable subspace:a comparison with the EnKF
Controlling instabilities 3DVar analysis cycle unstable subspace EnKF
2009/11/2
A hybrid scheme obtained by combining 3DVar with the Assimilation in the Unstable Subspace (3DVar-AUS) is tested in a QG model, under perfect model conditions, with a fixed observational network, with...
Coupling between reconnection and Kelvin-Helmholtz instabilities in collisionless plasmas
reconnection Kelvin-Helmholtz instabilities collisionless plasmas
2009/10/30
In a collisionless plasma, when reconnection instability takes place, strong shear flows may develop. Under appropriate conditions these shear flows become unstable to the Kelvin-Helmholtz instability...
Ion thermal effects on E-region instabilities: linear theory
E-region electrojet Ionospheric irregularities
2017/3/22
Linear instabilities and turbulent processes in ionospheric electrojets lead to the formation of plasma density
irregularities which create strong radar reflections. Studies of these irregularities h...
Ablation of micrometeoroids between 70 and 130 km altitude in the atmosphere
creates plasma columns with densities exceeding the ambient ionospheric electron density
by many orders of magnitude. Den...