Nonlocal dynamics of the collisional Rayleigh-Taylor instability: Applications to the equatorial spread F

Physics

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Ionosphere: Plasma Waves And Instabilities, Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Disturbances, Ionosphere: Ionospheric Irregularities

Scientific paper

The linear stability and eventual nonlinear saturation of plasma depletions in the high-altitude, F layer ionosphere are modeled via two-fluid equations for a plasma consisting of electrons and a single species of ions. Major emphasis is given to the nonlocal properties of the perturbations, permitting the description of relatively long wavelength modes (k⊥L->1, where L is a characteristic plasma scale length and k⊥ is the wavevector component perpendicular to the magnetic field), a regime not accessible under the often used ``local approximation.'' The condition for onset (marginal stability), as well as the spatial structure of strongly growing linear eigenmodes, are derived analytically for an ionosphere that includes a height-dependent collisional diffusion coefficient. A nonlinear model, comprising both quasilinear and three-wave coupling, is used to illustrate the dynamics of the depletions, and estimates are given for the saturated amplitudes.

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