Obliquely propagating ion-acoustic waves in a magnetized electron-positron-ion plasma with trapped electrons |
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Authors: | H Alinejad |
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Institution: | 1. Department of Physics, Faculty of Basic Science, Babol University of Technology, Babol, 47148-71167, Iran 2. Research Institute for Astronomy and Astrophysics of Maragha, Maragha, Iran
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Abstract: | A theoretical investigation is carried out for understanding the basic features of oblique propagation of linear and nonlinear
ion-acoustic waves subjected to an external magnetic field in an electron-positron-ion plasma which consists of a cold magnetized
ion fluid, Boltzmann distributed positron, and electrons obeying a trapped distribution. In the linear regime, two dispersion
curves are obtained. It is shown that the positron concentration causes the both modes to propagate with smaller phase velocities.
Then, owing to the presence of resonant electrons, the modified Korteweg-de Vries equation describing the nonlinear dynamics
of small but finite amplitude ion-acoustic waves is derived. It is found that the effects of external magnetic field (obliqueness),
trapped electrons, positron concentration and temperature ratio significantly modify the basic features of solitary waves. |
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Keywords: | |
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