A quasi-local theory of the E x B instability in the ionosphere

Details A quasi-local theory of the E x B instability in the ionosphere A quasi-local theory of the E x B instability in the ionosphere

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3263f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3263-3269. Navy-supported research.

Physics

20

E Region, Electric Fields, F Region, Ionospheric Disturbances, Magnetohydrodynamic Stability, Amplitudes, Plasma Turbulence, Shear, Simulation

Scientific paper

It is found that a new transient wave mode, which will be termed the quasi-local mode, is associated with the E x B instability in the presence of a velocity shear. This quasi-local wave mode is different from the nonlocal and the local eigenmodes, both of which have been studied extensively. The quasi-local mode has the following novel properties: (1) the quasi-local mode evolves from the local wave mode; (2) the wave number of the quasi-local mode increases with time; and (3) the wave mode grows, reaches a saturation level, then decays due to the increase of wave number. This mode may be responsible for the observed short wavelength turbulence (i.e., on scales less than 1 km) in the E and F regions of the ionosphere in the presence of strong velocity shear.

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