Generation of zonal flows by electrostatic drift waves in electron-positron-ion plasmas

2010 ◽  
Vol 17 (2) ◽  
pp. 022304 ◽  
Author(s):  
T. D. Kaladze ◽  
M. Shad ◽  
L. V. Tsamalashvili
Keyword(s):  
Drift Waves ◽  
Zonal Flows ◽  
Electron Positron

Generation of sheared flows by drift waves in a strongly magnetized electron–positron–ion plasma

2010 ◽  
Vol 77 (3) ◽  
pp. 339-344 ◽  
Author(s):  
NITIN SHUKLA ◽  
P. K. SHUKLA
Keyword(s):  
Modulational Instability ◽  
Drift Waves ◽  
Zonal Flows ◽  
Continuity Equations ◽  
The Poisson Equation ◽  
Ion Plasma ◽  
Electron Positron ◽  
Particle Velocities ◽  
Standard Techniques ◽  
Uniform Plasma

AbstractIt is shown that sheared/zonal flows (ZFs) can be nonlinearly excited by incoherent drift waves (DWs) in a strongly magnetized non-uniform plasma composed of electrons, positrons and ions. The dynamics of incoherent DWs in the presence of ZFs is governed by a wave-kinetic equation. The governing equation for ZFs in the presence of nonlinear forces (associated with nonlinear ion polarization and nonlinear ion-diamagnetic drifts) of the DWs is deduced by combining the Poisson equation, as well as the e-p-i continuity equations, together with appropriate plasma particle velocities in the DW and the ZF fields. Standard techniques are used to derive a nonlinear dispersion relation, which depicts two classes of the modulational instability of the DWs against the ZFs. Non-thermal ZFs can reduce the turbulent cross-field particle transport in non-uniform, strongly magnetized e-p-i plasmas.

Drift wave driven zonal flows in electron–positron–ion plasmas

2010 ◽  
Vol 76 (3-4) ◽  
pp. 635-643 ◽  
Author(s):  
T. D. KALADZE ◽  
O. A. POKHOTELOV ◽  
M. SHAD
Keyword(s):  
Growth Rate ◽  
Large Scale ◽  
Maximum Growth ◽  
Finite Amplitude ◽  
Maximum Growth Rate ◽  
Small Scale ◽  
Drift Waves ◽  
Zonal Flows ◽  
Electron Positron ◽  
Spatial Dimensions

AbstractThe generation of large-scale zonal flows by small-scale electrostatic drift waves in electron–positron–ion (EPI) plasma is considered. The generation mechanism is based on the parametric excitation of convective cells by finite amplitude drift waves. To describe this process, the Hasegawa–Mima equation generalized for the case of EPI plasma is used. Explicit expressions for the maximum growth rate as well as for the optimal spatial dimensions of the zonal flows are obtained. Dependence of the growth rate on the spectrum purity of the wave packet is also investigated. The relevant instability conditions are determined.

scholarly journals Excitation of zonal flow by the modulational instability in electron temperature gradient driven turbulence

2008 ◽  
Vol 74 (3) ◽  
pp. 381-389 ◽  
Author(s):  
Yu. A. ZALIZNYAK ◽  
A. I. YAKIMENKO ◽  
V. M. LASHKIN
Keyword(s):  
Temperature Gradient ◽  
Electron Temperature ◽  
Large Scale ◽  
Modulational Instability ◽  
Zonal Flow ◽  
Finite Amplitude ◽  
Small Scale ◽  
Drift Waves ◽  
Zonal Flows ◽  
Electron Temperature Gradient

AbstractThe generation of large-scale zonal flows by small-scale electrostatic drift waves in electron temperature gradient driven turbulence model is considered. The generation mechanism is based on the modulational instability of a finite amplitude monochromatic drift wave. The threshold and growth rate of the instability as well as the optimal spatial scale of zonal flow are obtained.

Nonlinear generation of zonal flows by drift waves

2001 ◽  
Vol 289 (4-5) ◽  
pp. 219-224 ◽  
Author(s):  
D Jovanović ◽  
P.K Shukla
Keyword(s):  
Drift Waves ◽  
Zonal Flows ◽  
Nonlinear Generation

scholarly journals Coexistence of Zonal Flows and Drift-Waves in a Cylindrical Magnetized Plasma

2008 ◽  
Vol 77 (11) ◽  
pp. 114501 ◽  
Author(s):  
Yoshihiko Nagashima ◽  
Sanae-I. Itoh ◽  
Shunjiro Shinohara ◽  
Masayuki Fukao ◽  
Akihide Fujisawa ◽  
...  
Keyword(s):  
Magnetized Plasma ◽  
Drift Waves ◽  
Zonal Flows

Generation of zonal flows by drift waves in a dusty plasma

2000 ◽  
Vol 7 (9) ◽  
pp. 3822-3825 ◽  
Author(s):  
P. K. Shukla
Keyword(s):  
Dusty Plasma ◽  
Drift Waves ◽  
Zonal Flows

Nonlinear electrostatic drift waves in dense electron-positron-ion plasmas

2008 ◽  
Vol 15 (8) ◽  
pp. 082315 ◽  
Author(s):  
Q. Haque ◽  
S. Mahmood ◽  
A. Mushtaq
Keyword(s):  
Drift Waves ◽  
Electron Positron

scholarly journals The Nature of Pulsar Subpulse Drift

1991 ◽  
Vol 44 (5) ◽  
pp. 573 ◽  
Author(s):  
AZ Kazbegi ◽  
GZ Machabeli ◽  
GI Melikidze
Keyword(s):  
Magnetic Field ◽  
Angular Velocity ◽  
Large Scale ◽  
Primary Particle ◽  
Particle Beam ◽  
Drift Waves ◽  
Electron Positron ◽  
Field Lines ◽  
The Magnetic Field ◽  
Open Magnetic Field

A possible mechanism for the explanation of pulsar subpulse drift is suggested. In the region of the open magnetic field lines the existence of an electron-positron plasma penetrated by a primary particle beam is assumed. There is a possibility of excitation of large-scale drift waves propagating transversely to the magnetic field lines. These waves can affect the fulfilment of the radio-wave generation conditions. If the pulsar angular velocity is near to the frequency of the drift waves one should observe regular drift phenomena.

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