Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa22c..06c&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA22C-06
Other
2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 2471 Plasma Waves And Instabilities
Scientific paper
The F layer is unstable at night as described by Perkins [1973]. Sporadic E (Es) layers are unstable at night as described by Cosgrove and Tsunoda [2002a, 2003]. Both instabilities involve the growth of plane-wave altitude modulations of their respective layers, and have growth rates that maximize for a tilted orientation of the plane wave phase fronts. Using the assumption that electric fields map between the E and F regions along magnetic field lines, we find that under certain conditions the two instabilities reinforce one another, thus giving rise to a coupled instability of the nighttime midlatitude ionosphere. The result is a verification of the coupled process postulated in Tsunoda and Cosgrove [2001]. The involvement of the wind-shear-driven Es layer polarization mechanism [Cosgrove and Tsunoda, 2002a] significantly enhances the growth rate for F region structure, as compared with the Perkins instability.
Cosgrove Russell B.
Tsunoda Roland T.
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