Nonlinear evolution of convecting plasma enhancements in the auroral ionosphere. II - Small scale irregularities

Details Nonlinear evolution of convecting plasma enhancements in the auroral ionosphere. II - Small scale irregularities Nonlinear evolution of convecting plasma enhancements in the auroral ionosphere. II - Small scale irregularities

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..474k&link_type=abstract

Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 474-482. Research supported by the U.S. Defense Nuclear Agency and U

Physics

25

Auroral Ionization, Convection, F Region, Ionospheric Drift, Ionospheric Electron Density, Magnetohydrodynamic Stability, Space Plasmas, Ionospheric Currents, Plasma Density, Plasma Layers, Simulation, Taylor Instability

Scientific paper

Using analytical and numerical simulation techniques, the linear stability and nonlinear evolution of small-scale (approximately 0.1-1 km) density irregularities in local unstable regions of large-scale convecting auroral plasma enhancements are investigated. The results show that these small-scale size irregularities are driven unstable primarily by the effects of convection through the E x B gradient drift instability. It is found that, in the nonlinear regime, the density irregularities in a plane nearly perpendicular to the magnetic field resemble steepened striation-like structures (elongated in the north-south direction for equatorward convection) that can form and cascade from kilometer to tens of meter scale sizes on the order of half an hour. It is proposed, using a crude model, that a two-step process, in which small-scale irregularities can grow on longer wavelength nonlinear structures, can account for the experimentally observed L shell aligned nature of the irregularities.

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