Nonlinear wave-wave interactions related to gravity wave reflection in the auroral upper F-region observed with the EISCAT radar

Details Nonlinear wave-wave interactions related to gravity wave reflection in the auroral upper F-region observed with the EISCAT radar Nonlinear wave-wave interactions related to gravity wave reflection in the auroral upper F-region observed with the EISCAT radar

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55..719m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 4-5, p. 719-731, 733-738.

Physics

7

Auroral Zones, Eiscat Radar System (Europe), F Region, Gravity Waves, Wave Reflection, Wave-Particle Interactions, Ionospheric Electron Density, Nonlinear Equations, Traveling Ionospheric Disturbances

Scientific paper

Some observational evidences of nonlinear wave-wave interactions associated with TIDs in the quiet daytime auroral F-region are presented. The dynamic frequency spectra in the upper F-region and the one-dimensional wavenumber spectra of TIDs show energy cascading from longer periods (larger scales) to shorter ones (smaller scales). The bispectra and the rates of change of the action density indicate that a chain of nonlinear resonant triad interactions take place. The observed nonlinear wave-wave interactions in the higher F-region are accompanied by negative values of the magnetic field, -(k sub xi) exp 3, and wave amplitude growth, which probably imply an over-reflection. This reflection is supported by sharp meridional natural wind shear and large incident wavelength. The weakness of the dispersion together with the reflection may enable the resonant conditions to be satisfied.

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