Nonlinear evolution of plasma enhancements in the auroral ionosphere. I - Long wavelength irregularities

Details Nonlinear evolution of plasma enhancements in the auroral ionosphere. I - Long wavelength irregularities Nonlinear evolution of plasma enhancements in the auroral ionosphere. I - Long wavelength irregularities

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87..144k&link_type=abstract

Journal of Geophysical Research, vol. 87, Jan. 1, 1982, p. 144-150. Research supported by the U.S. Defense Nuclear Agency and U

Physics

45

Atmospheric Ionization, Auroral Zones, F Region, Ionospheric Ion Density, Magnetohydrodynamic Stability, Space Plasmas, Atmospheric Models, Equations Of Motion, Field Aligned Currents, Nonlinear Equations, Plasma Slabs, Power Spectra

Scientific paper

Analytical and numerical simulation techniques are used in a study of the linear stability and nonlinear evolution of plasma enhancements in arbitrary electric fields, in the auroral F region ionosphere. Results indicate that a combination of the effects of convection and field-aligned currents destabilize the equatorward convecting plasma slabs that are initially limited in latitudinal extent, and that the plasma enhancements break up into primary striationlike structures which can form a cascade from large, (100-km) to smaller (3-km) scale sizes on the order of an hour. Depending on the ambient electric field magnitude and direction, the primary and associated, smaller-scale structures can be oriented in either the north-south or east-west direction.

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