Nonlinear coupling of lower hybrid waves to the kinetic low-frequency plasma response in the auroral ionosphere

1995 ◽  
Vol 22 (17) ◽  
pp. 2397-2400 ◽  
Author(s):  
K. Y. Sanbonmatsu ◽  
M. V. Goldman ◽  
D. L. Newman
Keyword(s):  
Low Frequency ◽  
Lower Hybrid ◽  
Nonlinear Coupling ◽  
Auroral Ionosphere ◽  
Frequency Plasma ◽  
Plasma Response ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

Excitation of lower hybrid waves by electron beams in finite geometry plasmas. Part 2. Surface waves

1978 ◽  
Vol 19 (2) ◽  
pp. 295-299
Author(s):  
Réal R. J. Gagné ◽  
Magdi M. Shoucri
Keyword(s):  
Electron Beam ◽  
Surface Waves ◽  
Electron Beams ◽  
Low Frequency ◽  
Finite Geometry ◽  
Dispersion Relations ◽  
Lower Hybrid ◽  
Small Density ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

The dispersion relations for the quasi-static lower hybrid surface waves are derived. Conditions for their existence and their linear excitation by a small density electron beam are discussed. Instabilities appearing in low-frequency surface waves are also discussed.

On the filamentation of large amplitude lower-hybrid waves

1977 ◽  
Vol 18 (1) ◽  
pp. 165-172 ◽  
Author(s):  
K. H. Spatschek ◽  
P. K. Shukla ◽  
M. Y. Yu
Keyword(s):  
Large Amplitude ◽  
Low Frequency ◽  
Lower Hybrid ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Convective Instabilities ◽  
Modulational Instabilities ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

We consider the propagation of a large-amplitude lower-hybrid wave. Modulational instabilities arising from its interaction with low-frequency electrostatic perturbations are investigated. The growth lengths of the convective instabilities are obtained and compared with previous results for adiabatic perturbations.

Nonlinear propagation of lower-hybrid waves in an inhomogeneous plasma

1978 ◽  
Vol 20 (2) ◽  
pp. 189-203 ◽  
Author(s):  
M. Y. Yu ◽  
P. K. Shukla ◽  
K. H. Spatschek
Keyword(s):  
Nonlinear Evolution ◽  
Inhomogeneous Plasma ◽  
Three Dimensional ◽  
Low Frequency ◽  
Nonlinear Propagation ◽  
Lower Hybrid ◽  
Density Perturbations ◽  
Hybrid Waves ◽  
Lower Hybrid Waves ◽  
Pump Depletion

We investigate the problem of spatial depletion of propagating lower-hybrid waves in an inhomogeneous plasma. In particular, we consider the nonlinear evolution of a lower-hybrid pump which is coupled to a daughter lower-hybrid decay wave excited by low-frequency density perturbations. Our results show that pump depletion occurs when three-dimensional effects are included. This phenomenon competes with the filamentation of the pump caused by self- interaction. Implications to lower-hybrid heating experiments are discussed.

Spectroscopic investigation of plasma turbulence

1979 ◽  
Vol 57 (6) ◽  
pp. 845-850 ◽  
Author(s):  
Y. S. Al-Shiraida ◽  
A. Hirose ◽  
H. M. Skarsgard
Keyword(s):  
Acoustic Waves ◽  
Energy Transport ◽  
Low Frequency ◽  
Skin Layer ◽  
Lower Hybrid ◽  
Direct Energy ◽  
Main Discharge ◽  
Hybrid Waves ◽  
The University ◽  
Lower Hybrid Waves

Optical studies of plasma fluctuations have been carried out in a toroidal, high-voltage discharge—the Plasma Betatron experiment at the University of Saskatchewan. Following the formation of the helium plasma, of density 1019–1020 m−3, by rf preionization and a preheating field, the electric field (≤ 8 kV/m) of the main discharge is applied parallel to the steady toroidal magnetic field of 0.3 T. Forbidden lines and satellites observed near the He I 21P–41D (4922 Å) and 23P–43D (4471 Å) lines show that low [Formula: see text] and high (ω ~ ωpe) frequency fluctuations are present at early times (t < 2 μs). The rms field strengths are comparable, at [Formula: see text]. An analysis is given of the possible role of these fluctuations in the rapid thermal transport previously observed from the current skin layer to the interior of the plasma. Direct energy transport by propagating electron plasma or ion acoustic waves is shown to be insignificant. However, the low frequency field strength is sufficient to allow for an explanation in terms of enhanced thermal diffusion due to lower hybrid waves.

Upper-hybrid solitons

1983 ◽  
Vol 61 (8) ◽  
pp. 1205-1211
Author(s):  
Bhimsen K. Shivamoggi
Keyword(s):  
Magnetic Field ◽  
Speed Of Sound ◽  
Modulational Instability ◽  
Low Frequency ◽  
Smooth Transition ◽  
Charge Neutrality ◽  
Envelope Solitons ◽  
Frequency Plasma ◽  
Plasma Response ◽  
Hybrid Waves

Modulational instability and formation of envelope solitons of the upper-hybrid waves are considered. A more consistent calculation is given here which also includes the effect of ion inertia. A strong magnetic field can eliminate the existence of subsonic upper-hybrid solitons but can make possible the existence of supersonic upper-hybrid solitons. In order to describe the upper-hybrid solitons travelling at the speed of sound, the ion nonlinearity is included in the calculation with the assumption of charge neutrality in the low frequency plasma response. An exact soliton solution moving at the speed of sound is then exhibited. Finally, a fully nonlinear theory of the formation of envelope solitons of upper-hybrid waves is given. The assumption of charge neutrality in the low frequency plasma response is abandoned. The solution shows a smooth transition from a single-hump soliton as the Mach number increases to unity. Furthermore, the dip at the centre for the double-hump soliton is found to become smaller as the magnetic field becomes stronger.

Transverse ion acceleration by localized lower hybrid waves in the topside auroral ionosphere

1992 ◽  
Vol 97 (A11) ◽  
pp. 16935 ◽  
Author(s):  
J. L. Vago ◽  
P. M. Kintner ◽  
S. W. Chesney ◽  
R. L. Arnoldy ◽  
K. A. Lynch ◽  
...  
Keyword(s):  
Ion Acceleration ◽  
Lower Hybrid ◽  
Auroral Ionosphere ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

scholarly journals Nonlinear Coupling of Lower-Hybrid Waves at the Edge of Tokamak Plasmas

1981 ◽  
Vol 46 (21) ◽  
pp. 1398-1401 ◽  
Author(s):  
V. B. Krapchev ◽  
K. S. Theilhaber ◽  
K. C. Ko ◽  
A. Bers
Keyword(s):  
Lower Hybrid ◽  
Nonlinear Coupling ◽  
Tokamak Plasmas ◽  
Hybrid Waves ◽  
Lower Hybrid Waves
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