Nonlinear evolution of the Kelvin-Helmholtz instability in the high-latitude ionosphere

Details Nonlinear evolution of the Kelvin-Helmholtz instability in the high-latitude ionosphere Nonlinear evolution of the Kelvin-Helmholtz instability in the high-latitude ionosphere

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..137k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 137-152. NASA-DNA-Navy-supported research.

Physics

81

Comet Tails, Kelvin-Helmholtz Instability, Polar Regions, Solar Wind, Velocity Distribution, Wave Propagation, Dynamics Explorer Satellites, Electric Fields, Flow Velocity, International Sun Earth Explorers, Periodic Variations, Polar Cusps

Scientific paper

The first numerical simulations of the nonlinear evolution of the electrostatic Kelvin-Helmholtz (K-H) instability with ionospheric Perderson conductivity coupling are presented. It is found that the K-H instability develops in a distinctly different manner in the nonlinear regime with Pedersen coupling than without it. Pedersen coupling effects, in conjunction with a neutral wind and density gradient, are shown to result in an increased time scale for K-H instability wave growth, to inhibit K-H vortex formation, to lead to nonlinear structures which can be described as 'breaking waves', and to generate, in the nonlinear regime, small-scale turbulence by means of secondary instabilities growing on primary waves. The spatial power spectra of the electrostatic potential and density fluctuations are computed, and differences with and without Pedersen effects are reported.

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