Influence of velocity shear on the Rayleigh‐Taylor instability

Guzdar, P. N.; Satyanarayana, P.; Huba, J. D.; Ossakow, S. L.

doi:10.1029/gl009i005p00547

Cited by 66 publications

(47 citation statements)

References 22 publications

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“…(6), do not accurately model the equatorial electrojet. However, based upon previous work (Guzdar et al, 1982;Hluba et al, 1983) and analysis of Eq. (14) using different plasma profiles, we find that the fundamental conclusion of this paper, viz., velocity shear can stabilize short wavelength modes of the gradient drift instability, Is not sensitive to the plasma profiles chosen.…”

Section: Discussionmentioning

confidence: 99%

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Short wavelength stabilization of the gradient drift instability due to velocity shear

Huba¹,

Lee²

1983

Geophysical Research Letters

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A nonlocal analysis of the gradient drift instability is presented. The new effect included in this theory is the allowance for an inhomogeneous electric field which produces a sheared drift velocity. It is found that velocity shear can stabilize the short wavelength modes of the instability, and preferentially excite a longer wavelength mode than would be expected based upon local theory. This result may explain the observations of dominant, long wavelength irregularities in the equatorial electrojet [Kudeki et al., 1982; Pfaff et al., 1982] and be relevant to the formation of auroral arc elements.

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Section: Discussionmentioning

confidence: 99%

“…First, studies of the Rayleigh-Taylor instability (Guzdar et al, 1982) and the Pedersen c'|trent driven gradient drift (or E x B) instability (Perkins and Doles, 1975; Juba *. L et al, 1983) indicate that velocity shear can have an i.portant effect on these instabilities.…”

Section: Manuscript Approved February 9 1983mentioning

confidence: 99%

Short wavelength stabilization of the gradient drift instability due to velocity shear

Huba¹,

Lee²

1983

Geophysical Research Letters

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“…Most of the research for nonlinear RT mode in the ionosphere has been restricted to collisional domain, although it has been shown that inertial effects are important in the high-latitude ionosphere. The influence of transverse velocity shear on Rayleigh-Taylor instability has been well investigated in the linear theory by various authors, especially, Guzdar, Satyanarayana, and their collaborators (Guzdar et al, 1982;Satyanarayana et al, 1987). They have found that a sheared velocity flow can substantially reduce the growth rate of a Rayleigh-Taylor instability in the short wavelength regime.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear saturation of Rayleigh-Taylor instability and generation of shear flow in equatorial spread-F plasma

Chakrabarti

Lakhina

2001

Nonlin. Processes Geophys.

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Abstract. An analysis of low order mode coupling equations is used to describe the nonlinear behavior of the RayleighTaylor (RT) instability in the equatorial ionosphere. The nonlinear evolution of RT instability leads to the development of shear flow. It is found that there is an interplay between the nonlinearity and the shear flow which compete with each other and saturate the RT mode, both in the collisionless and collisional regime. However, the nonlinearly saturated state, normally known as vortices or bubbles, may not be stable. Under certain condition these bubbles are shown to be unstable to short scale secondary instabilities that are driven by the large gradients which develop within these structures. Some understanding of the role of collisional nonlinearity in the shear flow generations is also discussed.

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“…This behavior has similarities with the growthrate observed by Guzdar et. al [16], where the competing effects were due to the KH and Rayleigh- …”

Section: B Second Velocity Profilementioning

confidence: 99%

“…al. [16] in 1982 found that velocity shear decreases the growth rate of the Rayleigh-Taylor mode and showed that unlike the static case, the most unstable wavenumber is finite. An analytic slab geometry calculation carried out by A.Hassam [17] demonstrated that velocity shear decreases the growth rate of the Rayleigh-Taylor instability and non-linearly positively stabilizes marginally stable profiles.…”

Section: Introductionmentioning

confidence: 99%