A numerical study of the gradient-drift instability growth rate at the fronts of the equatorial plasma bubbles
N. M. Kashchenko, S. A. Ishanov, S. V. Matsievsky
Kant Baltic Federal University
Ground and satellite measurements, as well as numerical modeling of the spatial structure
of equatorial ionospheric bubbles, are carried out quite intensively. These data show that
the longitude and altitude gradients of the electron density logarithm at the vertical
boundaries of the bubbles can reach values of 0.001 1/m and 0.0001 1/m, respectively.
With such electronic density concentration gradients, the gradient-drift instability can develop. This instability can generate ionospheric plasma irregularities with space-and-time
scales are characteristic of equatorial F-spread. This article presents results of calculation
of the gradient-drift instability growth rates at the ionospheric bubbles boundaries. The
space-and-time structure of the equatorial plasma bubbles is obtained by numerical modeling. This simulation is based on a two-dimensional numerical model of the Rayleigh–Taylor instability in the Earth's equatorial ionosphere. This model is constructing on the
condition that the Rayleigh–Taylor and gradient irregularities are strongly elongated
along the magnetic field lines. The growth rates of the plasma gradient-drift instability
are obtained from the dispersion equation. The results of numerical experiments confirm
the possibility of generating the gradient-drift instability of ionospheric plasma. This is
due to considerable longitude and altitude plasma gradients on the fronts of the developed equatorial plasma bubble. At the same time, the growth rate of the gradient-drift instability can reach values of 1/(170 s). The gradient-drift instability can be the cause of
the equatorial F-spread.
ionosphere, mathematical modeling, numerical modeling, equatorial plasma
bubble, growth rate, Rayleigh–Taylor instability, gradient-drift instability, F-spread.
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N. M. Kashchenko, S. A. Ishanov, S. V. Matsievsky, “A numerical study of the gradient-drift instability growth rate at the fronts of the equatorial plasma bubbles”, Matem. Mod., 32:11 (2020), 129–140
Citation in format AMSBIB
\by N.~M.~Kashchenko, S.~A.~Ishanov, S.~V.~Matsievsky
\paper A numerical study of the gradient-drift instability growth rate at the fronts of the equatorial plasma bubbles
\jour Matem. Mod.
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