Modulation instability of low-frequency electrostatic ion waves in magnetized electron-positron-ion plasma
- Theoretical Plasma Physics Group, Department of Physics, Quaid-i-Azam University, Islamabad 45320 (Pakistan)
- Pakistan Atomic Energy Commission, P. O. Box 1114, Islamabad 44000 (Pakistan)
- PINSTECH (NPD), P. O. Nilore, Islamabad (Pakistan)
The nonlinear amplitude modulation of low-frequency electrostatic ion waves propagating in collisionless magnetized electron-positron-ion plasma are studied. The Krylov-Bogoliubov-Mitropolsky perturbation method is employed to derive the nonlinear Schroedinger equation. Modulation instability of both ion-acoustic and ion-cyclotronlike modes is examined. We found that the ion-acoustic mode, which propagates below the ion-cyclotron frequency, is stable if the strength of the external magnetic field is small. However, as the strength of the magnetic field increases, this mode becomes modulationally unstable for a range of wave numbers and angles of propagation. This range increases as the strength of the magnetic field and/or positron density increases. For the ion-cyclotronlike mode, which propagates above the ion-cyclotron frequency, a number of stability/instability regions appear in the (k{sub c},{theta}) plane even for a very small value of the magnetic field. It is found that, for both modes, critical wave number k{sub c} separating the stability and instability regions, shifts towards higher values as the density of the positron increases.
- OSTI ID:
- 21269037
- Journal Information:
- Physics of Plasmas, Vol. 15, Issue 9; Other Information: DOI: 10.1063/1.2977768; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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