Parametric turbulence of a magnetized plasma due to the decay of an electromagnetic wave into two lower hybrid waves
The plasma turbulence resulting from the parametric decay of an intense pump wave into two lower hybrid waves in a magnetized plasma with ''magnetized'' electrons is analyzed. The threshold electric field for this parametric instability is directly proportional to the external magnetic field. The instability is saturated by induced scattering of the electrostatic waves on the ions. A nonlinear integro-differential equation for the spectral energy density at the lower hybrid resonance is obtained for small detuning and is solved in two limiting cases: differential and integral energy pumping over the spectrum. The solution yields the electrostatic energy density in the stationary turbulent state, the coefficient of nonlinear conversion of the pump into the lower hybrid resonance waves, and the scale times for the evolution of the turbulence. Illustrative numerical estimates for the plasma of the polar ionosphere are carried out on the basis of the final equations describing the plasma turbulence as a function of the properties of the pump wave, the plasma, and the fixed external magnetic field. (AIP)
- Research Organization:
- P. N. Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow
- OSTI ID:
- 7239988
- Journal Information:
- Sov. Phys. - Tech. Phys. (Engl. Transl.); (United States), Vol. 21:6
- Country of Publication:
- United States
- Language:
- English
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