Electron-acoustic solitary waves featuring nonthermal-nonextensive velocity distribution of electrons
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Date
2019
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Punjab Agricultural University, Ludhiana
Abstract
In this thesis, the problem of electron acoustic solitary waves in multicomponent plasma
consisting of cold and hot electron species and stationary ions is addressed. The hot electrons
are assumed to follow nonthermal-nonextensive distribution. The Sagdeev pseudopotential
technique is employed to investigate the occurrence of solitary structures. The Sagdeev
potential is obtained by solving a basic set of equations. The Sagdeev potential depends upon
parameters and q, where parameter defines nonthermality and q defines the strength of
nonextensivity. The given distribution is applicable to this study to a limited range of values
of q and , 0.6 q 1and 0 0.25. The various numerical results are plotted
graphically. For a selected range of parameters, it is found that only negative solitary waves
can exist. In other words, the present plasma model supports rarefactive solitary structures.
The existence of solitary wave comes within the range of allowable Mach number. It is
reported that the behavior of Mach number is significantly modified by nonextensivity q
and nonthermality . An increase of q makes rarefactive solitary structure more spiky. The
investigation shows that the amplitude of potential pulse decreases with the increase of
number of nonthermal electrons. The present plasma model may be helpful in understanding
the nonlinear phenomena in astrophysical plasmas.
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