Nonlinear stabilization of the current convection instability in the diffuse aurora

Details Nonlinear stabilization of the current convection instability in the diffuse aurora Nonlinear stabilization of the current convection instability in the diffuse aurora

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..957c&link_type=abstract

Geophysical Research Letters, vol. 6, Dec. 1979, p. 957-959. Research supported by the U.S. Defense Nuclear Agency and U.S. Nav

Physics

1

Auroras, Convective Flow, F Region, Magnetohydrodynamic Stability, Amplitudes, Coupled Modes, Field Aligned Currents, Harmonic Generations, Plasma Density

Scientific paper

The current convective instability has recently been proposed as a possible mechanism for generating large scale irregularities in the auroral F region, driven by weak field-aligned currents associated with the diffuse aurora and a plasma density gradient. In this report, we show that this instability can stabilize nonlinearly by generating linearly damped harmonics. An estimate of the saturated amplitudes shows good agreement with the available experimental data. In addition, with a northward plasma density gradient, the dominant nonlinear harmonic is in the northward direction, in agreement with DNA Wideband satellite observations.

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