Plasma collective modes driven by velocity gradients

Details Plasma collective modes driven by velocity gradients Plasma collective modes driven by velocity gradients

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9521213b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Dec. 1, 1990, p. 21213-21220. Research supported by USAF and Johns Ho

Physics

3

Flow Velocity, Kelvin-Helmholtz Instability, Magnetic Field Configurations, Magnetohydrodynamic Flow, Velocity Distribution, Auroral Arcs, F Region, Shear Flow

Scientific paper

Collisional modes driven by shear in the plasma flow velocity parallel to the magnetic field, are shown to exist over significant scale distances while subject to the constraints imposed by gradients in the transverse velocity, V(E) proportional to E x B. These constraints make the modes localized over finite distances around the surfaces where V(E) reaches a maximum or a minimum. Composite modes that can be constructed as a sequence or a superposition of these elementary normal modes can be excited in regions where the transverse velocity acquires a plateau type of profile that is assumed to be formed after macroscopic Kelvin-Helmholtz modes associated with the shear of V(E) have reached their saturation stage. Thus a significant rate of longitudinal plasma momentum transport in the transverse direction to the magnetic field can be produced. The relevance of this analysis to the fluctuations observed in the auroral F region is discussed.

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