Influence of Velocity Shear on the Rayleigh-Taylor Instability (2002)
Guzdar, P. N., Satyanarayana, P., Huba, J. D., Ossakow, S. L.
The influence of a transverse velocity shear on the Rayleigh-Taylor instability is investigated. It is found that a sheared velocity flow can substantially reduce the growth rate of the...
The Morphology of a Multi-Bubble System in the Ionosphere. (2002)
Chen,J., Satyanarayana,P., Ossakow,S. L.
A multi-bubble model is developed to study the morphology of a finite array of plasma density depletions (bubbles) in the context of equatorial F-region irregularities during spread F. The Pedersen...
Influence of Magnetic Shear on the Collisional Current Driven Ion Cyclotron Instability. (2002)
Satyanarayana,P., Ganguli,G., Ossakow,S. L.
The effects of magnetic shear on the collisional current driven ion cyclotron instability are discussed by incorporating the self-consistent magnetic shear produced by the currents driving the...
Effects of Finite Current Channel Width on the Current Convective Instability. (2002)
The effects of the finite current channel width on the current convective instability are studied both analytically and numerically. First, using a sharp-boundary field-aligned current distribution...
Theory of the Current-Driven Ion Cyclotron Instability in the Bottomside Ionosphere. (2002)
Satyanarayana,P., Chaturvedi,P. K., Keskinen,M. J., Huba,J. D., Ossakow,S. L.
A theory of the current-driven electrostatic ion cyclotron(EIC) instability in the collisional bottomside ionosphere is presented. It is found that the electron collisions are destabilizing and are...
Parallel Current Effects on Auroral E-Region Plasma Instabilities. (2002)
Chaturvedi,P. K., Huba,J. D., Ossakow,S. L., Satyanarayana,P.
Consider the effect of a field aligned current on the development of plasma instabilities in the auroral electrojet. It is found that the inclusion of the parallel current modifies the threshold...
On the Stability of a Stratified Shear Layer, (2002)
Satyanarayana,P., Lee,Y. E., Huba,J. D.
The stability of a stratified shear layer is investigated using an exponential density profile and a laminar shear flow with a continuous velocity distribution. It is shown that an exact stability...
Short Segment Analysis Of Speech For Enhancement (2000)
KEYWORDS: speech analysis; speech enhancement; linear prediction residual signal; reverberation; instants of signicant excitation.
Velocity Shear Stabilization of the Current Convective Instability. (1998)
Satyanarayana,P., Ossakow,S. L.
A nonlocal theory of the current convective instability in the presence of a transverse velocity shear is developed. It is found that the velocity shear stabilizes the short wavelength modes and...
Rayleigh-Taylor Instability in the Presence of a Stratified Shear Layer. (1998)
Satyanarayana,P., Guzdar,P. N., Huba,J. D., Ossakow,S. L.
A nonlocal theory of the Rayleigh-Taylor instability which includes the effect of a transverse velocity shear is presented. A two fluid model is used to describe an inhomogeneous plasma under the...
Quasi-Steady State Multi-Plasma Cloud Configuration in the Ionosphere. (1998)
Chen,J., Satyanarayana,P., Ossakow,S. L.
The morphology of a finite array of plasma density enhancements (multi plasma clouds) in the ionosphere is studied in order to determine the condition under which the system undergoes a quasi steady...
Satyanarayana,P., Lee,Y. C., Huba,J. D.
Electron parallel dynamics and Coulomb collisions are included in the analysis of the transverse Kelvin-Helmholtz instability. The electrons are treated kinetically while the ions are treated in the...
Nonlinear Evolution of the Kelvin-Helmholtz Instability in the High Latitude Ionosphere. (1998)
Keskinen, M. J., Mitchell, H. G., Fedder, J. A., Satyanarayana, P., Zalesak, S. T.
The nonlinear evolution of the electrostatic Kelvin Helmholtz instability, resulting from velocity-sheared plasma flows perpendicular to an ambient magnetic field, has been studied including Pedersen...
Satyanarayana, P., Keskinen, M. J., Chaturvedi, P. K., Ossakow, S. L.
Using an effective relaxation time model, the effects of ion-ion and ion-neutral collisions on quasilinear ion heating by the current-driven ion cyclotron instability in the high latitude ionosphere...
Zalesak, S. T., Huba, J. D., Satyanarayana, P.
A simple model is postulated for the freezing scale in nuclear plumes, whose success depends strongly on the high M ratios of nuclear plumes, and on the existence of some mechanism which causes the...
Effects of Magnetic and Collisional Viscosity on the E x B Gradient Drift Instability. (1998)
Zalesak, S. T., Huba, J. D., Satyanarayana, P.
The role of magnetic viscosity (i.e., Larmor radius effects) and collisional viscosity on the Ex B gradient drift instability is investigated in both the collisional and inertial regimes. The...