Influence of velocity shear on the Rayleigh-Taylor instability

Physics – Geophysics

Scientific paper

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Flow Velocity, Ionospheric Disturbances, Magnetohydrodynamic Stability, Rayleigh Waves, Shear Flow, Taylor Instability, Barium Ion Clouds, Geophysics, Kelvin-Helmholtz Instability, Kilometric Waves, Plasma Layers, Plasma Oscillations, Spread F, Transverse Waves, Wavelengths

Scientific paper

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 Rayleigh-Taylor instability in the short-wavelength regime having kL is greater than unity where L is the scale length of the density inhomogeneity, and causes the growth rate to maximize at kL lower than unity. Applications of this result to ionospheric phenomena such as the equatorial spread F (ESF), and ionospheric plasma clouds are discussed. In particular, the effect of shear could account for, at times, the hundreds-of-km modulation observed on the bottomside of the ESF ionosphere and the km-scale wavelengths observed in barium cloud prompt striation phenomena.

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