Short wavelength stabilization of the gradient drift instability due to velocity shear

Details Short wavelength stabilization of the gradient drift instability due to velocity shear Short wavelength stabilization of the gradient drift instability due to velocity shear

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..357h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, April 1983, p. 357-360. Research supported by the U.S. Defense Nuclear A

Physics

17

Auroral Arcs, Equatorial Electrojet, Ionospheric Drift, Magnetohydrodynamic Stability, Short Wave Radio Transmission, Taylor Instability, Collisional Plasmas, Drift Rate, E Region, Electric Fields, Hall Effect, Plasma Clouds

Scientific paper

A nonlocal analysis of the gradient drift instability is presented. The new effect included in this theory is the allowance for an inhomogeneous electric field which produces a sheared drift velocity. It is found that velocity shear can stabilize the short wavelength modes of the instability, and preferentially excite a longer wavelength mode than would be expected based upon local theory. This result may explain the observations of dominant, long wavelength irregularities in the equatorial electrojet (Kudeki et al., 1982; Pfaff et al., 1982) and be relevant to the formation of auroral arc elements.

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