Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9549l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9549-9565.
Physics
14
Auroral Zones, Earth Magnetosphere, Geomagnetism, Rotating Fluids, Shear Layers, Field Aligned Currents, Force-Free Magnetic Fields, Incompressible Flow, Magnetohydrodynamic Waves, Volt-Ampere Characteristics
Scientific paper
Incompressible one-fluid MHD is used to study the stability, dynamics, and energetics of a auroral shear layer for the case when current flow through the system is limited by the finite Pedersen conductivity and an enhanced field-aligned resistivity. Neutral stability of the model system is determined for a class of one-dimensional equilibria in which a specified current distribution at the upper boundary of the viscous/polarization layer produces a potential structure with convergent, localized reversals in the transverse electric field. Numerical simulations of unstable configurations show that (1) two-dimensional quasi-steady rotational states arise when the equilibrium is weakly unstable, (2) eddy shedding turbulent states can arise when the equilibrium is strongly unstable, and (3) the flow kinetic energy and energy input/dissipation rates in the model system are reduced as a consequence of the instability.
Lotko William
Shen Mingmin
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