Fluctuations associated with sheared velocity regions near auroral arcs

Details Fluctuations associated with sheared velocity regions near auroral arcs Fluctuations associated with sheared velocity regions near auroral arcs

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..417b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, May 1988, p. 417-420. USAF-supported research.

Physics

16

Auroral Arcs, Collisional Plasmas, F Region, Ionospheric Disturbances, Magnetohydrodynamic Stability, Electrostatic Waves, Field Aligned Currents, Ionospheric Electron Density, Plasma Dynamics, Shear Layers

Scientific paper

This paper presents a theory of electrostatic collisional plasma modes that are driven unstable by sheared field-aligned ion flow velocity. It is shown that the linear instability provides a direct means for the excitation of the subkilometer irregularities in the auroral F-region, with were reported by Basu et al. (1988). The spectral characteristics of the density and the electric field fluctuations that can be inferred from the theory are shown to be consistent with those of the observations.

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