Solitary and shock waves in magnetized electron-positron plasma

An Ohm's law for electron-positron (EP) plasma is obtained. In the framework of EP magnetohydrodynamics, we investigate nonrelativistic nonlinear waves' solutions in a magnetized EP plasma. In the collisionless limit, quasistationary propagating solitary wave structures for the magnetic fi...

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Bibliographic Details
Published in:Physics of plasmas 2014-02, Vol.21 (2), p.22108
Main Authors: Lu, Ding, Li, Zi-Liang, Abdukerim, Nuriman, Xie, Bai-Song
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COLLISIONS
ELECTROMAGNETIC FIELDS
ELECTRON TEMPERATURE
Electron-positron plasmas
ELECTRONS
Fluid dynamics
ION TEMPERATURE
MACH NUMBER
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
OHM LAW
Ohm's Law
Plasma
PLASMA DENSITY
Plasma physics
Plasma temperature
POSITRONS
SHOCK WAVES
Solitary waves
Temperature dependence
Wave propagation
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Summary:An Ohm's law for electron-positron (EP) plasma is obtained. In the framework of EP magnetohydrodynamics, we investigate nonrelativistic nonlinear waves' solutions in a magnetized EP plasma. In the collisionless limit, quasistationary propagating solitary wave structures for the magnetic field and the plasma density are obtained. It is found that the wave amplitude increases with the Mach number and the Alfvén speed. However, the dependence on the plasma temperature is just the opposite. Moreover, for a cold EP plasma, the existence range of the solitary waves depends only on the Alfvén speed. For a hot EP plasma, the existence range depends on the Alfvén speed as well as the plasma temperature. In the presence of collision, the electromagnetic fields and the plasma density can appear as oscillatory shock structures because of the dissipation caused by the collisions. As the collision frequency increases, the oscillatory shock structure becomes more and more monotonic.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4864650