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Nonlinear electrostatic solitary waves in electron–positron plasmas

Published online by Cambridge University Press:  19 February 2016

I. J. Lazarus ,
R. Bharuthram ,
S. Moolla ,
S. V. Singh  and
G. S. Lakhina
I. J. Lazarus*
Affiliation:
Department of Physics, Durban University of Technology, Durban 4001, South Africa
R. Bharuthram
Affiliation:
University of the Western Cape, Modderdam Road, Bellville 7530, South Africa
S. Moolla
Affiliation:
School of Physics, University of KwaZulu-Natal, Durban 4000, South Africa
S. V. Singh
Affiliation:
Indian Institute of Geomagnetism, Navi Mumbai 401206, India
G. S. Lakhina
Affiliation:
Indian Institute of Geomagnetism, Navi Mumbai 401206, India
*
†Email address for correspondence: [email protected]
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Abstract

The generation of nonlinear electrostatic solitary waves (ESWs) is explored in a magnetized four component two-temperature electron–positron plasma. Fluid theory is used to derive a set of nonlinear equations for the ESWs, which propagate obliquely to an external magnetic field. The electric field structures are examined for various plasma parameters and are shown to yield sinusoidal, sawtooth and bipolar waveforms. It is found that an increase in the densities of the electrons and positrons strengthen the nonlinearity while the periodicity and nonlinearity of the wave increases as the cool-to-hot temperature ratio increases. Our results could be useful in understanding nonlinear propagation of waves in astrophysical environments and related laboratory experiments.

Type
Research Article
Information
Journal of Plasma Physics , Volume 82 , Issue 1 , February 2016 , 905820108
Copyright
© Cambridge University Press 2016 

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