Feedback instability of the ionospheric resonant cavity

Details Feedback instability of the ionospheric resonant cavity Feedback instability of the ionospheric resonant cavity

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1553l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1553-1568.

Physics

181

Auroras, Cavity Resonators, Feedback, Ionospheric Propagation, Magnetosphere-Ionosphere Coupling, Atmospheric Heating, Atmospheric Turbulence, Field Aligned Currents, Ionospheric Currents, Magnetohydrodynamic Waves, Wave Reflection

Scientific paper

A model is developed that provides a theoretical basis for previous numerical results showing a feedback instability with frequencies characteristic of Alfven travel times within the region of the large increase of Alfven speed above the ionosphere. These results have been extended to arbitrary ionospheric conductivity by developing a numerical solution of the cavity dispersion relation that involves Bessel functions of complex order and argument. It is concluded that the large contrast between the magnetospheric and ionospheric Alfven speed leads to the formation of resonant cavity modes with frequencies ranging from 0.1 to 1 Hz. The presence of the cavity leads to a modification of the reflection characteristics of Alfven waves with frequencies that compare to the cavity's normal modes.

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