Parametric excitation of kinetic waves—Ion-Bernstein waves by a lower hybrid pump wave

1977 ◽  
Vol 20 (10) ◽  
pp. 1704 ◽  
Author(s):  
Duncan C. Watson ◽  
Abraham Bers
Keyword(s):  
Parametric Excitation ◽  
Pump Wave ◽  
Lower Hybrid ◽  
Bernstein Waves

Scattering of electromagnetic waves by anomalous fluctuations of a magnetized plasma

1990 ◽  
Vol 43 (2) ◽  
pp. 165-172 ◽  
Author(s):  
V. N. Pavlenko ◽  
V. G. Panchenko
Keyword(s):  
Cross Section ◽  
Electromagnetic Waves ◽  
Pump Wave ◽  
Density Fluctuations ◽  
Scattering Cross Section ◽  
Magnetized Plasma ◽  
Lower Hybrid ◽  
Scattering Cross ◽  
Parametric Decay ◽  
Ion Acoustic

Fluctuations and scattering of transverse electromagnetic waves by density fluctuations in a magnetized plasma in the presence of parametric decay of the pump wave are investigated. The spectral density of electron-density fluctuations is calculated. It is shown that the differential scattering cross-section has sharp maxima at the ion-acoustic and lower-hybrid frequencies when parametric decay of the lower-hybrid pump wave occurs. We note that scattering at the ion-acoustic frequency is dominant. When the pump-wave amplitude tends to the threshold strength of the electric field the scattering cross-section increases anomalously, i.e. there is critical opalescence.

Parametric excitation of a lower‐hybrid drift wave in the ionosphere

1995 ◽  
Vol 2 (12) ◽  
pp. 4617-4620
Author(s):  
B. K. Sawhney ◽  
V. K. Tripathi ◽  
S. V. Singh
Keyword(s):  
Parametric Excitation ◽  
Lower Hybrid ◽  
Drift Wave

Parametric instability of hydromagnetic waves with oblique propagation

1981 ◽  
Vol 26 (3) ◽  
pp. 497-507 ◽  
Author(s):  
Kiyohumi Yumoto
Keyword(s):  
Magnetic Field ◽  
Theoretical Model ◽  
Pump Power ◽  
Small Perturbation ◽  
Static Magnetic Field ◽  
Parametric Excitation ◽  
Growth Rates ◽  
Pump Wave ◽  
Perfect Matching ◽  
Pump Intensity

The parametric excitation of Alfvén waves by two magnetosonic waves, which propagate obliquely to the static magnetic field, is analysed. The theoretical model used is the uniform, unbounded, ideally conducting and compressible one-fluid plasma, with suitable resonance conditions. Our consideration is restricted to determining the conditions under which some initially small perturbation grows, so that the magnetosonic pump wave is regarded as constant. It is found that, both in the case of the standing and the propagating pump, the growth rates of the excited waves depend not only on the pump power but also on β, and that the threshold pump intensities are proportional to β. In the case of the standing pump, the threshold pump intensity of the oscillating instability is zero at perfect matching. The parametric excitation of Alfvén waves by two magnetosonic waves, which propagate obliquely to the static magnetic field, is analysed. The theoretical model used is the uniform, unbounded, ideally conducting and compressible one-fluid plasma, with suitable resonance conditions. Our consideration is restricted to determining the conditions under which some initially small perturbation grows, so that the magnetosonic pump wave is regarded as constant. It is found that, both in the case of the standing and the propagating pump, the growth rates of the excited waves depend not only on the pump power but also on β, and that the threshold pump intensities are proportional to β. In the case of the standing pump, the threshold pump intensity of the oscillating instability is zero at perfect matching.

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