Low-frequency gradient-drift instability in a plasma with a field-aligned current

Details Low-frequency gradient-drift instability in a plasma with a field-aligned current Low-frequency gradient-drift instability in a plasma with a field-aligned current

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ge%26ae..27..212k&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 27, Mar.-Apr. 1987, p. 212-216. In Russian.

Physics

Auroral Zones, Field Aligned Currents, Ionospheric Drift, Magnetohydrodynamic Stability, Plasma Currents, Plasma Drift, Space Plasmas, Differential Equations, Frequency Response, Plasma Layers, Transition Layers

Scientific paper

The low-frequency gradient-drift instability in a plasma with an exponential density profile is examined on the basis of a quasi-hydrodynamic method in the potential approximation with reference to processes in the auroral ionosphere. It is shown that, at a frequency near the ion gyrofrequency, the irregularity of the medium can lead to both wave excitation and stabilization, the determining factor being the structure of the disturbed fields. In the region of current-instability development, an increase in gamma is connected with the finite width of the transition layer.

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