Ion-acoustic double layers in magnetized positive-negative ion plasmas with nonthermal electrons |
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| Authors: | S K El-Labany R Sabry W F El-Taibany E A Elghmaz |
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| Institution: | (1) Department of Physics, Faculty of Science, Mansoura University, Damietta-Branch, New Damietta, 34517, Egypt;(2) Department of Physics, College of Science and Humanitarian Studies, Salman bin Abdulaziz University, Alkharj, Kingdom of Saudi Arabia;(3) International Centre for Advanced Studies in Physical Sciences, Faculty of Physics and Astronomy, Ruhr University Bochum, 44780 Bochum, Germany;(4) Department of Physics, College of Science for Girls in Abha, King Khalid University, Abha, P.O. 960, Kingdom of Saudi Arabia;(5) University Center for Girls’ Study, King Khalid University, Abha, P.O. 3340, Kingdom of Saudi Arabia |
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| Abstract: | The nonlinear ion-acoustic double layers (IADLs) in a warm magnetoplasma with positive-negative ions and nonthermal electrons
are investigated. For this purpose, the hydrodynamic equations for the positive-negative ions, nonthermal electron density
distribution, and the Poisson equation are used to derive a modified Zakharov–Kuznetsov (MZK) equation, in the small amplitude
regime. It is found that compressive and rarefactive IADLs strongly depend on the mass and density ratios of the negative-to-positive
ions as well as the nonthermal electron parameter. Also, it is shown that there are one critical value for the density ratio
of the negative-to-positive ions (ν), the ratio between unperturbed electron-to-positive ion density (μ), and the nonthermal electron parameter (β), which decide the existence of positive and negative IADLs. The present study is applied to examine the small amplitude
nonlinear IADL excitations for the (H+, O2-)(\mathrm{H}^{+}, \mathrm{O}_{2}^{-}) and (H+,H−) plasmas, where they are found in the D- and F-regions of the Earth’s ionosphere. This investigation should be helpful in
understanding the salient features of the nonlinear IADLs in either space or laboratory plasmas where two distinct groups
of ions and non-Boltzmann distributed electrons are present. |
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