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- Title
Role of entropy in η<sub>i</sub>-mode driven nonlinear structures obtained by homotopy perturbation method in electron–positron–ion plasma.
- Authors
Khan, Aziz; Zakir, U.; Haque, Qamar ul; Qamar, Anisa
- Abstract
We present an analysis of the effect of entropy on ion temperature gradient ηi-mode driven solitary and shock waves in electron–positron–ion plasma having density and temperature inhomogeneities. Linear and nonlinear analysis having solutions in form of solitons and shocks shows that entropy influence changes the drift mode instability. Different limiting cases when (i) temperature fluctuations due to E × B only (ηi ≫ 2/3), (ii) in the absence of entropy and (iii) neglecting positron effect (β = 1) are discussed. The homotophy perturbation method (HPM) is applied on the derived Korteweg–de-Vries (KdV) and KdV–Burger equations under small time approximation. It is found that both results, those obtained analytically and by the HPM technique, strongly agree with each other. These investigations may be useful to study low frequency electrostatic modes in magnetized electron–positron–ion plasma. For illustration, the model has been applied to the nonlinear electrostatic excitations in interstellar medium and tokamak plasma.
- Subjects
ENTROPY; POSITRONS
- Publication
Zeitschrift für Naturforschung Section A: A Journal of Physical Sciences, 2021, Vol 76, Issue 8, p671
- ISSN
0932-0784
- Publication type
Article
- DOI
10.1515/zna-2021-0031