Variation of Type I Plasma Wave Phase Velocity with Electron Drift Velocity in the Equatorial Electrojet

1993 ◽  
Vol 98 (A12) ◽  
pp. 21581-21591 ◽  
Author(s):  
Sudha Ravindran ◽  
C. A. Reddy
Keyword(s):  
Phase Velocity ◽  
Plasma Wave ◽  
Drift Velocity ◽  
Equatorial Electrojet ◽  
Electron Drift Velocity ◽  
Type I ◽  
Electron Drift ◽  
Wave Phase ◽  
Wave Phase Velocity

Lower-hybrid instability in current-carrying plasmas

1982 ◽  
Vol 28 (3) ◽  
pp. 527-537 ◽  
Author(s):  
Joseph E. Willett ◽  
Hassan Mehdian
Keyword(s):  
Phase Velocity ◽  
Drift Velocity ◽  
Numerical Study ◽  
Electron Drift Velocity ◽  
Lower Hybrid ◽  
Electron Drift ◽  
Plasma Parameters ◽  
The Stability ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

The stability of lower-hybrid waves in a collisional, fully ionized plasma carrying a field-aligned current is investigated. From the two-fluid equations in the cold-plasma approximation, a generalized dispersion relation and formulae for the real frequency ωI and growth rate ωR are derived. The results of a numerical study are presented showing the dependence of ωR and ωI on the angle between the direction of propagation and the magnetic field, the ratio of the electron drift velocity to the parallel phase velocity, and other plasma parameters. Lower-hybrid instability with electron drift velocity small compared with the parallel phase velocity is predicted.

scholarly journals Pulse evolution and plasma-wave phase velocity in channel-guided laser-plasma accelerators

2015 ◽  
Vol 92 (2) ◽  
Author(s):  
C. Benedetti ◽  
F. Rossi ◽  
C. B. Schroeder ◽  
E. Esarey ◽  
W. P. Leemans
Keyword(s):  
Phase Velocity ◽  
Plasma Wave ◽  
Laser Plasma ◽  
Wave Phase ◽  
Wave Phase Velocity ◽  
Plasma Accelerators

scholarly journals The electron drift velocity, ion acoustic speed and irregularity drifts in high-latitude E-region

2008 ◽  
Vol 26 (11) ◽  
pp. 3395-3409 ◽  
Author(s):  
M. V. Uspensky ◽  
R. J. Pellinen ◽  
P. Janhunen
Keyword(s):  
Drift Velocity ◽  
Equatorial Electrojet ◽  
Electron Drift Velocity ◽  
Doppler Velocity ◽  
Electron Drift ◽  
Velocity Dependence ◽  
Flow Angle ◽  
Aspect Angle ◽  
Ion Acoustic ◽  
Acoustic Speed

Abstract. The purpose of this study is to examine the STARE irregularity drift velocity dependence on the EISCAT line-of-sight (los or l-o-s) electron drift velocity magnitude, VE×Blos, and the flow angle ΘN,F (superscript N and/or F refer to the STARE Norway and Finland radar). In the noon-evening sector the flow angle dependence of Doppler velocities, VirrN,F, inside and outside the Farley-Buneman (FB) instability cone (|VE×Blos|>Cs and |VE×Blos|<Cs, respectively, where Cs is the ion acoustic speed), is found to be similar and much weaker than suggested earlier. In a band of flow angles 45°<ΘN,F<85° it can be reasonably described by |VirrN,F|∝AN,FCscosnΘN,F, where AN,F≈1.2–1.3 are monotonically increasing functions of VE×B and the index n is ~0.2 or even smaller. This study (a) does not support the conclusion by Nielsen and Schlegel (1985), Nielsen et al. (2002, their #[18]) that at flow angles larger than ~60° (or |VirrN,F|≤300 m/s) the STARE Doppler velocities are equal to the component of the electron drift velocity. We found (b) that if the data points are averages over 100 m/s intervals (bins) of l-o-s electron velocities and 10 deg intervals (bins) of flow angles, then the largest STARE Doppler velocities always reside inside the bin with the largest flow angle. In the flow angle bin 80° the STARE Doppler velocity is larger than its driver term, i.e. the EISCAT l-o-s electron drift velocity component, |VirrN,F|>|VE×Blos|. Both features (a and b) as well as the weak flow angle velocity dependence indicate that the l-o-s electron drift velocity cannot be the sole factor which controls the motion of the backscatter ~1-m irregularities at large flow angles. Importantly, the backscatter was collected at aspect angle ~1° and flow angle Θ>60°, where linear fluid and kinetic theories invariably predict negative growth rates. At least qualitatively, all the facts can be reasonably explained by nonlinear wave-wave coupling found and described by Kudeki and Farley (1989), Lu et al. (2008) for the equatorial electrojet and studied in numerical simulation by Otani and Oppenheim (1998, 2006).

Electron drift velocity in lead telluride at high electric fields

1983 ◽  
Vol 54 (11) ◽  
pp. 6439-6442 ◽  
Author(s):  
D. Chattopadhyay ◽  
N. N. Purkait
Keyword(s):  
Electric Fields ◽  
Drift Velocity ◽  
Lead Telluride ◽  
Electron Drift Velocity ◽  
Electron Drift ◽  
High Electric Fields
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