Turbulent Alfven boundary layer in the polar ionosphere. I - Excitation conditions and energetics

Details Turbulent Alfven boundary layer in the polar ionosphere. I - Excitation conditions and energetics Turbulent Alfven boundary layer in the polar ionosphere. I - Excitation conditions and energetics

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619363t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Nov. 1, 1991, p. 19,363-19,374.

Physics

61

Earth Ionosphere, Electron Energy, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Polar Regions, Turbulent Boundary Layer, E Region, Flux Density, Particle Energy

Scientific paper

Instability of laminar magnetospheric convection with respect to the strongly anisotropic Alfven waves which are of small scale in the horizontal plane is examined. The waves prove to be trapped in the ionospheric Alfven resonator, bounded from below by the ionospheric E layer and from above by a zone of rapidly increasing Alfven velocity at altitudes of up to about 10 exp 4 km. The finite-amplitude Alfven waves dissipate within a layer of anomalous resistance formed near the upper wall of the resonator. As a result, a high-energy particle source appears in the upper ionosphere. Further evolution results in the transition of laminar convection to turbulent flow conditions and in the formation of a turbulent Alfven boundary layer in the polar ionosphere at altitudes from 100 to 10,000 km. The energy status of the turbulent Alfven boundary layer is calculated. It has been shown that the accelerated-electron energy flux density can reach about 100 ergs/sq cm per sec.

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