Parametric decay of an electromagnetic pump wave in a two-dimensionally inhomogeneous plasma

1999 ◽  
Vol 6 (1) ◽  
pp. 268-278 ◽  
Author(s):  
N. Borisov ◽  
P. Stubbe ◽  
L. Gorbunov
Keyword(s):  
Pump Wave ◽  
Inhomogeneous Plasma ◽  
Parametric Decay ◽  
Electromagnetic Pump

Stimulated Raman backscattering in a magnetized plasma

1978 ◽  
Vol 19 (2) ◽  
pp. 313-324 ◽  
Author(s):  
Joseph E. Willett ◽  
Behrooz Maraghechi
Keyword(s):  
Cold Plasma ◽  
Pump Wave ◽  
Electron Plasma ◽  
Magnetized Plasma ◽  
Threshold Power ◽  
Pump Frequency ◽  
Electron Plasma Wave ◽  
Parametric Decay ◽  
Electromagnetic Pump ◽  
Stimulated Raman Backscattering

The parametric decay of an intense electromagnetic (pump) wave into a back-scattered electromagnetic wave and an electron plasma wave is considered. The dispersion relation for a homogeneous magnetized plasma in the presence of the pump wave is developed in the cold-plasma approximation with the pump frequency large compared to the cyclotron and plasma frequencies. Formulae are derived for the growth rate γ and threshold power PT associated with the instability. The effects of the magnitude and direction of the static magnetic field on γ and PT are studied numerically.

Parametric decay in a two-electron-temperature plasma

1990 ◽  
Vol 43 (3) ◽  
pp. 451-456
Author(s):  
S. Guha ◽  
Meenu Asthana
Keyword(s):  
Growth Rate ◽  
Dispersion Relation ◽  
Electron Temperature ◽  
Pump Wave ◽  
Nonlinear Dispersion ◽  
Hybrid Wave ◽  
Temperature Plasma ◽  
Parametric Decay ◽  
Electromagnetic Pump ◽  
Nonlinear Dispersion Relation

Nonlinear decay of an ordinary electromagnetic pump wave into an electro-acoustic wave and an upper-hybrid wave in a two-electron-temperature plasma has been investigated analytically. In contrast with the work of Sharma, Ramamurthy & Yu (1984), it is found that the decay can take place in the absence of the restrictive condition Ti ≫ Te and the plasma be magnetized. Using a hydrodynamical model of the plasma, the nonlinear dispersion relation and growth rate are obtained. A comparison of the present investigation is made with earlier work, and its possible application to the ELMO bumpy torus is discussed.

scholarly journals Influence of Inhomogeneity on Transformation and Radiation Processes in Plasma with Upper Hybrid Pump

2019 ◽  
Vol 64 (9) ◽  
pp. 814
Author(s):  
V. G. Panchenko ◽  
P. V. Porytsky
Keyword(s):  
Pump Wave ◽  
Inhomogeneous Plasma ◽  
Parametric Instability ◽  
Langmuir Wave ◽  
Wave Transformation ◽  
Transformation Coefficient ◽  
Radiation Emission ◽  
Parametric Decay ◽  
Radiation Processes ◽  
Transverse Electromagnetic

On the basis of the kinetic theory of fluctuations, the processes of the longitudinal Langmuir wave transformation into a transverse electromagnetic wave in the turbulent inhomogeneous plasma have been studied. The plasma turbulence is assumed to arise owing to the parametric decay of the upper hybrid pump wave into a daughter wave and electron-drift oscillations. The transformation coefficient under the parametric instability saturation conditions is determined. The intensity of the electromagnetic radiation emission from the plasma is calculated, and its dependence on the plasma and pump wave parameters is found.

Parametric decay instability of an inhomogeneous plasma in a frequency-modulated pump wave

2000 ◽  
Vol 26 (4) ◽  
pp. 314-319 ◽  
Author(s):  
V. I. Arkhipenko ◽  
V. N. Budnikov ◽  
E. Z. Gusakov ◽  
A. K. Kapanik ◽  
V. A. Pisarev ◽  
...  
Keyword(s):  
Pump Wave ◽  
Inhomogeneous Plasma ◽  
Decay Instability ◽  
Parametric Decay ◽  
Parametric Decay Instability

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.

scholarly journals Computer simulations for direct conversion of the HF electromagnetic wave into the upper hybrid wave in ionospheric heating experiments

1998 ◽  
Vol 16 (10) ◽  
pp. 1251-1258 ◽  
Author(s):  
H. O. Ueda ◽  
Y. Omura ◽  
H. Matsumoto
Keyword(s):  
Pump Wave ◽  
Maximum Amplitude ◽  
Direct Conversion ◽  
Conversion Process ◽  
Small Scale ◽  
Ionospheric Heating ◽  
Particle In Cell ◽  
Electromagnetic Pump ◽  
Excited Wave ◽  
Hybrid Waves

Abstract. Excitation of upper hybrid waves associated with the ionospheric heating experiments is assumed to be essential in explaining some of the features of stimulated electromagnetic emissions (SEE). A direct conversion process is proposed as an excitation mechanism of the upper hybrid waves where the energy of an obliquely propagating electromagnetic pump wave is converted into the electrostatic upper hybrid waves due to small-scale density irregularities. We performed electromagnetic particle-in-cell simulations to investigate the energy conversion process in the ionospheric heating experiments. We studied dependence of the amplitude of the excited wave on the propagation angle of the pump wave, scale length of the density irregularity, degree of the irregularity, and thermal velocity of the plasma. The maximum amplitude is found to be 37 of the pump amplitude under an optimum condition.Key words. Ionosphere (ionospheric irregularities; plasma waves and instabilities; wave-particle interactions).

Decay instability of cirularly polarized waves into cirularly polarized and Langmuir waves in a magnetized plasma

1974 ◽  
Vol 11 (1) ◽  
pp. 99-109 ◽  
Author(s):  
Kai Fong Lee
Keyword(s):  
Pump Wave ◽  
Parametric Instability ◽  
Perturbation Expansion ◽  
Langmuir Wave ◽  
Magnetized Plasma ◽  
Multiple Time ◽  
Langmuir Waves ◽  
Left Hand ◽  
Electromagnetic Pump ◽  
Polarized Waves

A study is made of a parametric instability in a magnetized plasma in which an electromagnetic pump wave of either right- or left-hand circular polarization decays into a Langmuir wave and another circularly polarized wave, all with wave vectors colinear with the external magnetic field. The analysis is based on a multiple-time-scale perturbation expansion of the fluid equations, incorporating the effects of temperature, collisions, and the spatial variation of the pump wave. The threshold values of the pump field intensity required for instability and the growth rates above threshold are calculated.

Stimulated backscattering of electromagnetic ordinary waves from extraordinary waves below the upper hybrid frequency

1979 ◽  
Vol 21 (1) ◽  
pp. 97-106 ◽  
Author(s):  
Behrooz Maraghechi ◽  
Joseph E. Willett
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Static Magnetic Field ◽  
Inhomogeneous Plasma ◽  
Extraordinary Wave ◽  
Threshold Power ◽  
Ordinary Wave ◽  
Homogeneous Plasma ◽  
Parametric Decay ◽  
Hybrid Frequency

The parametric decay of an intense electromagnetic ordinary wave, propagating perpendicular to a uniform static magnetic field, into an extraordinary wave and a backscattered ordinary wave is investigated. Formulae are derived for the growth rate and threshold power associated with the instability in a homogeneous plasma. An analysis of the spatial amplification of the decay waves in an inhomogeneous plasma is presented. The effects of the uniform static magnetic field on the backscattering in both homogeneous and inhomogeneous plasmas are studied numerically.

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