Three-dimensional numerical simulations of equatorial spread F: Results and observations in the Pacific sector

Details Three-dimensional numerical simulations of equatorial spread F: Results and observations in the Pacific sector Three-dimensional numerical simulations of equatorial spread F: Results and observations in the Pacific sector

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11703325a&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue A3, CiteID A03325

Physics

1

Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Irregularities, Ionosphere: Modeling And Forecasting, Magnetospheric Physics: Numerical Modeling, Space Weather: Forecasting (1922, 2722, 4315)

Scientific paper

A three-dimensional numerical simulation of plasma density irregularities in the postsunset equatorial F region ionosphere leading to equatorial spread F (ESF) is described. The simulation evolves under realistic background conditions including bottomside plasma shear flow and vertical current. It also incorporates C/NOFS satellite data which partially specify the forcing. A combination of generalized Rayleigh-Taylor instability (GRT) and collisional shear instability (CSI) produces growing waveforms with key features that agree with C/NOFS satellite and ALTAIR radar observations in the Pacific sector, including features such as gross morphology and rates of development. The transient response of CSI is consistent with the observation of bottomside waves with wavelengths close to 30 km, whereas the steady state behavior of the combined instability can account for the 100+ km wavelength waves that predominate in the F region.

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