Modulational instability of electromagnetic ion-cyclotron waves by ion acoustic waves in a collisionless plasma
Using the hydrodynamic model for a homogeneous plasma, we have investigated the modulational instability of an electromagnetic ion-cyclotron wave by a low-frequency electrostatic ion acoustic mode in a collisionless plasma. The low-frequency nonlinearity of the instability arises through the parallel ponderomotive force on the ions, and the high-frequency nonlinearity arises through the nonlinear current densities of the ions. For typical plasma parameters n/sup 0//sub 0/ = 10/sup 13/ cm/sup -3/, ..omega../sub c/i/..omega../sub 0/ = 1.2, B/sub s/ = 10 kG, T/sub i/ = 1 keV, T/sub i/ = 0.05 keV, and theta = 30/sup 0/, the growth rate of the instability turns out to be approx.10/sup 4/ rad sec/sup -1/ for Vertical Barv/sub 0i/xVertical BarC/sub s/Vertical Bar = 10/sup -2/, where v/sub 0i/x is the pump-induced drift velocity of the ions and C/sub s/ is the ion acoustic velocity in the plasma.
- Research Organization:
- Department of Physics, Jahangirnagar University, Dacca, Bangladesh
- OSTI ID:
- 5753235
- Journal Information:
- Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 25:1; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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