Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa44a..01t&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA44A-01
Physics
2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere
Scientific paper
Two plasma-structuring mechanisms are known to operate at night in the midlatitude ionosphere, the Perkins instability [Perkins, 1973] in the F region, and the sporadic-E layer (EsL) instability [Cosgrove and Tsunoda, 2002] in the E region. Both are layer processes, whose coupled response has been shown to be more unstable than either by itself [Cosgrove and Tsunoda, 2004]. In this presentation, simplified descriptions are used to examine the underlying physics. Growth rates of both instabilities are shown to be enhanced by polarization electric fields that map in altitude and add in phase. The F-layer response is shown to be strongest with control imposed by E-region parameters and loading of the EsL instability by the F layer. Conditions for coupling through 'spatial resonance' are clarified, shown to be realistic, and similar to those required for the Perkins instability. The new findings are incorporated into a scenario that seems to explain a number of hitherto puzzling observations.
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