Sheared-flow-driven vortices in a magnetized dusty electron–positron plasma

2000 ◽  
Vol 64 (4) ◽  
pp. 427-431 ◽  
Author(s):  
P. K. SHUKLA ◽  
T. FARID ◽  
L. STENFLO ◽  
O. G. ONISHCHENKO
Keyword(s):  
Plasma Flows ◽  
Coupled Modes ◽  
Electrostatic Waves ◽  
Sheared Flow ◽  
Electron Positron ◽  
Laboratory Plasmas ◽  
Coherent Vortices ◽  
Vortex Chain

It is shown that sheared plasma flows can generate nonthermal electrostatic waves in a magnetized dusty electron–positron plasma. Linearly excited modes attain large amplitudes and start interacting among themselves. Nonlinearly coupled modes self-organize in the form of coherent vortices comprising a vortex chain and a double vortex. Conditions under which the latter appear are given. The relevance of our investigation to space, astrophysical, and laboratory plasmas is pointed out.

Sheared flow-driven vortices and solitary waves in a non-uniform plasma with negative ions and non-thermal distributed electrons

2012 ◽  
Vol 79 (5) ◽  
pp. 479-487 ◽  
Author(s):  
A. MUSHTAQ ◽  
ATTAULLAH SHAH
Keyword(s):  
Solitary Wave Solution ◽  
Negative Ions ◽  
Type Equation ◽  
Sheared Flow ◽  
Positive Ions ◽  
Laboratory Plasmas ◽  
Vortex Chain ◽  
Dia Waves ◽  
Scalar Nonlinearity ◽  
Uniform Plasma

AbstractThe coupled drift-ion acoustic (DIA) waves in an inhomogeneous magnetoplasma having negative and positive ions can be driven by the parallel sheared flows in the presence of Cairns distributed non-thermal electrons. The coupled DIA waves can become unstable due to shear flows. The conditions of modes instability are discussed with effects of non-thermal electrons. These are the excited modes and start interactions among themselves. The interaction is governed by the Hasegawa–Mima equations with analytical solutions in the form of a vortex chain and dipolar vortex. On the other hand, for scalar nonlinearity the Kortweg deVries-type equation is obtained with solitary wave solution. Possible application of the work to the space and laboratory plasmas are highlighted.

scholarly journals Beltrami fields in a hot electron–positron–ion plasma

2012 ◽  
Vol 78 (3) ◽  
pp. 207-210 ◽  
Author(s):  
M. IQBAL ◽  
P. K. SHUKLA
Keyword(s):  
Magnetic Field ◽  
Plasma Flow ◽  
Strong Interaction ◽  
Field Configuration ◽  
Hot Electron ◽  
Magnetic Field Configuration ◽  
Beltrami Fields ◽  
Ion Plasma ◽  
Electron Positron ◽  
Laboratory Plasmas

AbstractA possibility of relaxation of relativistically hot electron and positron (e − p) plasma with a small fraction of hot or cold ions has been investigated analytically. It is observed that a strong interaction of plasma flow and field leads to a non-force-free relaxed magnetic field configuration governed by the triple curl Beltrami (TCB) equation. The triple curl Beltrami (TCB) field composed of three different Beltrami fields gives rise to three multiscale relaxed structures. The results may have the strong relevance to some astrophysical and laboratory plasmas.

Linear electrostatic waves in a three-component electron-positron-ion plasma

2014 ◽  
Vol 21 (12) ◽  
pp. 122119 ◽  
Author(s):  
A. Mugemana ◽  
I. J. Lazarus ◽  
S. Moolla
Keyword(s):  
Electrostatic Waves ◽  
Ion Plasma ◽  
Electron Positron

Exact electrostatic waves in electron–positron plasmas

2010 ◽  
Vol 81 (4) ◽  
pp. 045503 ◽  
Author(s):  
Gaimin Lu ◽  
Yue Liu ◽  
M Y Yu
Keyword(s):  
Electrostatic Waves ◽  
Electron Positron

Wave kinetic description of quantum pair plasmas

2008 ◽  
Vol 74 (1) ◽  
pp. 91-97 ◽  
Author(s):  
J. T. MENDONÇA ◽  
J. E. RIBEIRO ◽  
P. K. SHUKLA
Keyword(s):  
Dispersion Relation ◽  
Classical Limit ◽  
Landau Damping ◽  
Quantum Plasma ◽  
Kinetic Description ◽  
Electrostatic Waves ◽  
Pair Plasma ◽  
Electron Positron ◽  
Two Component ◽  
Electron Positron Pair

AbstractThe dispersion relation for a quantum pair plasma is derived, by using a wave kinetic description. A general form of the kinetic dispersion relation for electrostatic waves in a two-component quantum plasma is established. The particular case of an electron–positron pair plasma is considered in detail. Exact expressions for Landau damping are derived, and the quasi-classical limit is discussed.

Multiscale structures in a two-temperature relativistic electron-positron-ion plasma

2013 ◽  
Vol 79 (5) ◽  
pp. 715-720 ◽  
Author(s):  
M. IQBAL ◽  
P. K. SHUKLA
Keyword(s):  
Pressure Ratio ◽  
Hot Electron ◽  
Scale Parameters ◽  
Electron Positron ◽  
Laboratory Plasmas ◽  
Complex Roots ◽  
Plasma Species ◽  
Affected Relative ◽  
Multiscale Structures ◽  
Two Temperature

AbstractA relativistically hot electron, positron and ion (e–p–i) plasma relaxes to a triple curl Beltrami (TCB) field. The TCB field being the superposition of three Beltrami fields is characterized by three scale parameters and hence there exist multiscale structures in the system. It is shown that temperatures of the plasma constituents strongly affect the scale parameters. Generally, the scale parameters associated with the TCB field may be a combination of real and complex roots. The numerical results show that for given Beltrami parameters, an increase in the thermal energy of plasma particles could transform the real eigenvalues to complex ones. It is also observed that one component is more strongly affected relative to other components on increasing temperatures of plasma species. Two different vortices become the same at higher thermal energies. This suggests that it is possible to create high β (kinetic to magnetic pressure ratio) and fully diamagnetic plasma configurations. The study has a potential relevance to space, astrophysics and laboratory plasmas.

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