A nonlocal linear theory of the gradient drift instability in the equatorial electrojet

Details A nonlocal linear theory of the gradient drift instability in the equatorial electrojet A nonlocal linear theory of the gradient drift instability in the equatorial electrojet

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1317r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1317-1326. Research supported by NSF.

Physics

23

Equatorial Electrojet, Ionospheric Drift, Daytime, Linear Equations, Particle Collisions

Scientific paper

The linear global eigenmodes of the gradient drift instability in the daytime equatorial electrojet are examined, including ion-neutral and electron-neutral collision frequencies dependent on altitude. The basic characteristics and localization of the unstable modes are determined by profiles of the Pedersen and Hall mobilities derived from the Cowling conductivity model and experimental data. It is shown that the previously reported short-wavelength stabilization effect due to velocity shear may be overshadowed by the presence of regions in which the transient modes can develop into absolute instabilities.

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