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Electron acoustic double layers in a magnetized plasma in the presence of superthermal particles

Published online by Cambridge University Press:  21 June 2019

D. Dutta Open the ORCID record for D. Dutta [Opens in a new window]  and
K. S. Goswami
D. Dutta*
Affiliation:
Physics Department, Gauhati University, Guwahati, 781014, India Centre of Plasma Physics-Institute for Plasma Research, Nazirakhat, Sonapur, 782402, India
K. S. Goswami
Affiliation:
Centre of Plasma Physics-Institute for Plasma Research, Nazirakhat, Sonapur, 782402, India
*
†Email address for correspondence: dutta3dharitree@gmail.com
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Abstract

An analytical study of the small amplitude electron acoustic double layers in a magnetized plasma consisting of superthermal electrons and ions along with cold fluid electrons is discussed. The dispersion relation allows electron acoustic waves with the frequency within electron and ion gyro-frequency in the modelled plasma. In the process of study of the nonlinear structures, the Sagdeev pseudo-potential method for small amplitude regions is employed. The existence domains for the double layers are investigated in terms of the Mach numbers of the structures and the temperature ratios of the species for different ratios of their concentration. The effects of the compositional parameters on the nature and size of the double layers are also explored and it is observed that the plasma can support both compressive and rarefactive double layers depending on the values of those parameters and the Mach numbers.

Keywords

plasma nonlinear phenomenaplasma wavesspace plasma physics
Type
Research Article
Information
Journal of Plasma Physics , Volume 85 , Issue 3 , June 2019 , 905850308
Copyright
© Cambridge University Press 2019 

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