Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas

Journal Article · Mon Sep 15 04:00:00 EDT 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4896346· OSTI ID:22303431

Adnan, Muhammad; Qamar, Anisa ^[1]; Mahmood, S. ^[2]

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1. Institute of Physics and Electronics, University of Peshawar, Peshawar 25000 (Pakistan)
2. National Center for Physics, Quaid-i-Azam University Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan)

Linear and nonlinear coupled drift-ion acoustic waves are investigated in a nonuniform magnetoplasma having kappa distributed electrons and positrons. In the linear regime, the role of kappa distribution and positron content on the dispersion relation has been highlighted; it is found that strong superthermality (low value of κ) and addition of positrons lowers the phase velocity via decreasing the fundamental scalelengths of the plasmas. In the nonlinear regime, first, coherent nonlinear structure in the form of dipoles and monopoles are obtained and the boundary conditions (boundedness) in the context of superthermality and positron concentrations are discussed. Second, in case of scalar nonlinearity, a Korteweg–de Vries-type equation is obtained, which admit solitary wave solution. It is found that both compressive and rarefactive solitons are formed in the present model. The present work may be useful to understand the low frequency electrostatic modes in inhomogeneous electron positron ion plasmas, which exist in astrophysical plasma situations such as those found in the pulsar magnetosphere.

• OSTI ID: 22303431
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 21; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
79 ASTRONOMY AND ASTROPHYSICS
ASTROPHYSICS
BOUNDARY CONDITIONS
DISPERSION RELATIONS
ELECTRONS
ION DRIFT
IONS
NONLINEAR PROBLEMS
PHASE VELOCITY
PLASMA
POSITRONS
WAVE PROPAGATION