Nonlinear unstable auroral-arc driven thermospheric winds in an ionosphere-magnetosphere coupled model

Details Nonlinear unstable auroral-arc driven thermospheric winds in an ionosphere-magnetosphere coupled model Nonlinear unstable auroral-arc driven thermospheric winds in an ionosphere-magnetosphere coupled model

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2687k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 23, p. 2687-2690

Physics

2

Auroral Arcs, Earth Ionosphere, Earth Magnetosphere, Magnetosphere-Ionosphere Coupling, Nonlinearity, Thermosphere, Wind (Meteorology), Zonal Flow (Meteorology), Kelvin-Helmholtz Instability, Power Spectra, Three Dimensional Models, Vortices

Scientific paper

The nonlinear evolution of thermospheric winds in an ionosphere-magnetosphere coupled model has been studied for the first time for a dynamic unstable auroral-arc environment. We treat the problem using a multi-layer, quasi-three-dimensional model which averages in altitude the thermospheric dynamics over each layer. For the upper thermosphere, we find that (1) the thermosphere can respond to the ionospheric Kelvin-Helmholtz (KH) instability on temporal scales on the order of an hour, depending on ambient conditions, and on spatial scales of tens to hundreds of kilometers, (2) strong thermospheric meridional and zonal vortical flows with embedded nonlinear jet-like structures can be generated by the ionospheric/magnetospheric KH instability and (3) neutral thermospheric winds, vortices, and associated power spectra develop in a distinctly different manner in the presence of magnetospheric coupling effects. Comparison with recent observations is made.

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