Experimental verification of the inhomogeneous energy-density driven instability

Koepke, M. E.; Amatucci, W. E.; Carroll, J. J.; Sheridan, T. E.

doi:10.1103/physrevlett.72.3355

Cited by 88 publications

(52 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The instabilities could be the collisional drift wave instability, centrifugal instability, Kelvin-Helmholz instability, and inhomogeneous energy-density driven instability (IEED) $ [6,13]$ . In the present case, in which $(\kappa^{2}+k^{2})\gg(\Omega_{e}/\nu_{e})(r_{d}\Omega_{i}/C_{s})$ is satisfied, the drift wave instability is dominant, which is destabilized by collisions.…”

mentioning

confidence: 99%

Spiral Structures in Magnetized Rotating Plasmas

Kono

Tanaka

2000

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

mentioning

confidence: 99%

Spiral Structures in Magnetized Rotating Plasmas

Kono

Tanaka

2000

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…Furthermore, in the theoretical studies of Ganguli and Palmadesso (1988), Ganguli et al (1994), and Gavrishchaka et al (1996), it was shown that by changing the resonance properties of the system a combination of transverse localized electric fields and fieldaligned currents results in a lower excitation threshold current for CDEIC waves than inferred from the classical theory of the CDEIC instability. This theoretical prediction was validated in a number of laboratory experiments (Koepke and Amatucci, 1992;Amatucci et al, 1994;Koepke et al, 1994). It was also corroborated experimentally that broadband waves in the ion-cyclotron frequency range can be driven solely by a transverse, localized electric field, without the dissipation of a field-aligned current (Amatucci et al, 1998).…”

Section: Introductionmentioning

confidence: 51%

Evaluation of a space-observed electric field structure for the ability to destabilize inhomogeneous energy-density-driven waves

et al. 2014

View full text Add to dashboard Cite

Abstract.We examine the effectiveness of nonuniform, quasistatic, transverse electric fields that are often observed in the auroral region in destabilization of inhomogeneous energy-density-driven (IEDD) waves. Specifically, the IEDD dispersion relation of Ganguli et al. (1985a, b) is evaluated for an electric field structure observed by the FAST satellite in the auroral ionosphere at 1000 km altitude. The background field-aligned current, plasma density and ion composition are derived from FAST observations. Other input parameters adopted in the calculations are varied in pertinent ranges. Unstable solutions are obtained that indicate a variety of frequencies and perpendicular wavelengths. These can manifest as a broadband spectrum of IEDD waves.

show abstract

“…In recent experiments on Inhomogeneous Energy-Density Driven (IEDD) waves (Ganguli et al, 1985;Koepke et al, 1994;Amatucci et al, 1996;, quantitative comparisons with theoretical predictions were obtained (Koepke et al, 1995;1998a;Amatucci et al, 1998;Carroll et al, 1998;Peñano et al, 1998). Beyond verifying the existence of the excitation mechanism, Correspondence to: M. E. Koepke (mkoepke@wvu.edu) these comparisons reinforced detailed aspects of the theoretical model and also stimulated refinements and an expanded awareness of the details of the model.…”

Section: Introductionmentioning

confidence: 86%

Resonant-to-nonresonant transition in electrostatic ion-cyclotron wave phase velocity

Carroll

Koepke

Zintl

et al. 2003

Nonlin. Processes Geophys.

Self Cite

View full text Add to dashboard Cite

Abstract. Because of the implications for plasmas in the laboratory and in space, attention has been drawn to inhomogeneous energy-density driven (IEDD) waves that are sustained by velocity-shear-induced inhomogeneity in crossfield plasma flow. These waves have a frequency ω r in the lab frame within an order of magnitude of the ion gyrofrequency ω ci , propagate nearly perpendicular to the magnetic field (k z /k ⊥ 1), and can be Landau resonant (0 < ω 1 /k z < ν d ) with a parallel drifting electron population (drift speed ν d ), where subscripts 1 and r indicate frequency in the frame of flowing ions and in the lab frame, respectively, and k z is the parallel component of the wavevector. A transition in phase velocity from 0 < ω 1 /k z < ν d to 0 > ω 1 /k z > ν d for a pair of IEDD eigenmodes is observed as the degree of inhomogeneity in the transverse E × B flow is increased in a magnetized plasma column. For weaker velocity shear, both eigenmodes are dissipative, i.e. in Landau resonance, with k z ν d > 0. For stronger shear, both eigenmodes become reactive, with one's wavevector component k z remaining parallel, but with ω 1 /k z > ν d , and the other's wavevector component k z becoming anti-parallel, so that 0 > ω 1 /k z . For both eigenmodes, the transition (1) involves a small frequency shift and (2) does not involve a sign change in the wave energy density, which is proportional to ω r ω 1 , both of which are previously unrecognized aspects of inhomogeneous energydensity driven waves.

show abstract

Experimental verification of the inhomogeneous energy-density driven instability

Cited by 88 publications

References 19 publications

Spiral Structures in Magnetized Rotating Plasmas

Spiral Structures in Magnetized Rotating Plasmas

Evaluation of a space-observed electric field structure for the ability to destabilize inhomogeneous energy-density-driven waves

Resonant-to-nonresonant transition in electrostatic ion-cyclotron wave phase velocity

Contact Info

Product

Resources

About