Electrostatic solitary ion waves in dense electron-positron-ion magnetoplasma

Journal Article · Wed Apr 15 04:00:00 EDT 2009 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3118590· OSTI ID:21276992

Jehan, Nusrat ^[1]; Salahuddin, M ^[2]; Mahmood, S ^[3]; Mirza, Arshad M ^[1]

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1. Department of Physics, Theoretical Plasma Physics Group, Quaid-i-Azam University, Islamabad 45320 (Pakistan)
2. Pakistan Atomic Energy Commission, P.O. Box 1114, Islamabad 44000 (Pakistan)
3. Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad 44000 (Pakistan)

The nonlinear coupled ion-acoustic and ion-cyclotron waves propagating obliquely to the external magnetic field in dense collisionless electron-positron-ion magnetoplasma are investigated using Sagdeev potential method. A semiclassical approach is used. Electrons and positrons are treated as degenerate Fermi gases described by Thomas-Fermi density distribution and ions behave as classical gas. It is found that the presence of degenerate positrons in a dense Thomas-Fermi plasma significantly modifies the structure of solitary waves by restricting the electrostatic potential to a certain maximum value which depends upon the concentration of positrons in the system. It is also noted that only subsonic humplike solitary waves can exist and for a given angle of propagation, the presence of degenerate positrons diminishes the amplitude as well as width of the solitary wave.

• OSTI ID: 21276992
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 16; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COLLISIONLESS PLASMA
ELECTRONS
FERMI GAS
ION ACOUSTIC WAVES
ION PLASMA WAVES
IONS
NONLINEAR PROBLEMS
POSITRONS
SOLITONS
THOMAS-FERMI MODEL