Nonplanar dust ion-acoustic solitary and shock excitations in electronegative plasmas with trapped electrons |
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Authors: | S K El-Labany W M Moslem N A El-Bedwehy H N Abd El-Razek |
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Institution: | 1. Theoretical Physics Group, Department of Physics, Faculty of Science, Mansoura University, Damietta Branch, New Damietta, 34517, Egypt 2. Department of Physics, Faculty of Science, Port Said University, Port Said, Egypt 3. International Centre for Advanced Studies in Physical Sciences, Faculty of Physics and Astronomy, Ruhr University Bochum, 44780, Bochum, Germany 4. Department of Mathematics, Faculty of Science, Mansoura University, Damietta Branch, New Damietta, 34517, Egypt
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Abstract: | It is shown that the three-dimensional cylindrical Kadomtsev-Petviashvili (CKP) and the extended cylindrical Kadomtsev-Petviashvili
(ECKP) equations can describe the propagation of nonplanar dust ion-acoustic excitations in a dusty plasma composed of positive
ions, negative ions, stationary dust particles, as well as trapped electrons or a small percentage of trapped electrons. It
is found that the solution of the CKP equation supports only solitary pulses, while the ECKP equation describes the propagation
of both solitary and shock excitations. The effects of physical parameters, namely negative ions density, dust grains density,
positive-to-negative mass ratio, direction cosine of the wave propagation on the pulses profile are examined. Furthermore,
the existence regions of either localized or shock pulses are investigated. The relevance of nonlinear structures in the Earth’s
ionosphere and plasma experiment is discussed. |
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