Self-consistent studies of two-dimensional large-scale /about 100 m/ electrojet irregularities

Details Self-consistent studies of two-dimensional large-scale /about 100 m/ electrojet irregularities Self-consistent studies of two-dimensional large-scale /about 100 m/ electrojet irregularities

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.3248s&link_type=abstract

Journal of Geophysical Research, vol. 81, July 1, 1976, p. 3248-3256.

Physics

5

Electric Fields, Electron Density (Concentration), Equatorial Electrojet, Plasma Turbulence, Amplitudes, Density Distribution, Fourier Analysis, Graphs (Charts), Magnetohydrodynamic Stability

Scientific paper

The paper studies cross-field instability in a two-dimensional geometry, with particular reference to the stabilization mechanism of the most unstable waves of order 100 m and the large-scale nonlinear structure. To simulate the electrojet irregularities, a model is considered in which the collision frequencies are constant and the density profile is described by a hyperbolic tangent function; this choice of the density profile is made so that the instability is limited within a certain height range. Major conclusions are that the main stabilization mechanism is the density profile change due to the vertical nonlinear mass transport, that the saturation amplitude of density irregularities is almost independent of the electrojet speed but largely dependent on the density profile, and that the electrojet speed is significantly decreased especially at the most unstable height. A sequence of compressed and rarefied pulses appears in the direction of the density inhomogeneity as a result of nonlinear interactions. Results are compared with nonlinear theories.

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