Nonlinear evolution of thermal self-focusing instability in ionospheric modifications at high latitudes: Aspect angle dependence

Details Nonlinear evolution of thermal self-focusing instability in ionospheric modifications at high latitudes: Aspect angle dependence Nonlinear evolution of thermal self-focusing instability in ionospheric modifications at high latitudes: Aspect angle dependence

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3316104g&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 16, CiteID L16104

Physics

2

Ionosphere: Electric Fields (2712), Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Temperature And Density, Ionosphere: Plasma Waves And Instabilities (2772), Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934)

Scientific paper

A first simulation study for the nonlinear evolution of the thermal self-focusing instability at high latitudes to examine the dependence of the nonlinear effects on the direction of the heater beam is presented. We demonstrate that due to a local heating of the F region anisotropic plasma, field-aligned bunch-scale structures with a strong enhancement of the electron temperature and negative density perturbations inside these structures are developed. The electron temperature increases up to more than 200% of the background when the incident beam is near the magnetic zenith, as observed in the heating experiment at the EISCAT high-latitude facility (Rietveld et al., 2003). The values of the simulated electron temperature enhancements show a strong dependence on the heater beam direction that is in very good agreement with the EISCAT observations.

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