Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas
![Thumbnail](/bitstream/handle/10183/142379/000943751.pdf.jpg?sequence=3&isAllowed=y)
View/ Open
Date
2014Type
Subject
Abstract
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 j) and addition of positrons lowers the phase velocity via decreasing the fundamental scalelengths of the plasmas. In the nonlinear regime, first, coherent nonlinear struc ...
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 j) 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. ...
In
Physics of plasmas. Melville. Vol. 21, no. 9 (Sept. 2014), 092119, 8 p.
Source
Foreign
Collections
-
Journal Articles (39541)Exact and Earth Sciences (6036)
This item is licensed under a Creative Commons License
![](/themes/Mirage2Novo//images/lume/cc.png)