Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa33a1127h&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SA33A-1127
Physics
2415 Equatorial Ionosphere, 2439 Ionospheric Irregularities, 2471 Plasma Waves And Instabilities
Scientific paper
This paper analyzes the possible role of shear flow in initiating equatorial spread F events. A new collisional shear instability in a magnetized plasma is described and evaluated. The instability is related to electrostatic Kelvin Helmholtz but operates in inhomogeneous plasmas in the collisional regime. Boundary value analysis predicts that the linear growth rate for waves with wavelengths close to 4π times the shear scale length could become comparable to that of the collisional interchange instability in the equatorial F region ionosphere under ideal conditions. An initial value simulation of a nonlinear model of the instability run under realistic conditions meanwhile produces growing waves with an initial wavelength of about 30 km. The simulation results are consistent with recent Jicamarca and Altair radar observations indicating large-scale plasma waves in the bottomside equatorial ionosphere at sunset prior to the onset of spread F conditions.
Hysell Dave L.
Kudeki Erhan
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