Simulation of the Non-Linear Evolution of the Sporadic-E Layer Instability in the Nighttime Midlatitude Iononsphere

Details Simulation of the Non-Linear Evolution of the Sporadic-E Layer Instability in the Nighttime Midlatitude Iononsphere Simulation of the Non-Linear Evolution of the Sporadic-E Layer Instability in the Nighttime Midlatitude Iononsphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa72b0540c&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA72B-0540

Physics

2411 Electric Fields (2712), 2439 Ionospheric Irregularities, 2471 Plasma Waves And Instabilities

Scientific paper

Recently, it has been shown that the configuration of a midlatitude sporadic-E (Es) layer at a zonal wind-shear node becomes unstable at night [Cosgrove and Tsunoda, 2002]. The instability is the result of electrodynamical forces that arise when plane wave perturbations in altitude or density are imposed on the Es layer. The growth rate of the instability depends on the azimuthal alignment of the plane wave distortion, a feature that is reminiscient of the Perkins instability \markcite{[Perkins, 1973]}. In this paper, the non-linear evolution of the instability is simulated using the flux corrected transport finite difference method, for the orientation of maximum growth rate. It is found that the instability growth generates significant polarization electric fields and structuring of the layer, yet can saturate without destroying the layer completely. The necessary ionospheric conditions, and relevance to observed Es layer phenomena (such as QP echoes and frontal structures) are investigated.

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