Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4178l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 1, 1985, p. 4178-4190.
Physics
84
Auroral Electrojets, Electrodynamics, Ionospheric Currents, Magnetohydrodynamics, Electric Fields, Electrical Resistivity, Field Aligned Currents, Hall Effect, Magnetohydrodynamic Waves, Maxwell Equation, Ohms Law, Voltage Generators
Scientific paper
The electrodynamic structure of auroral currents is studied in the steady state by coupling Maxwell's equations with effective Ohm's laws for ionospheric Pedersen currents, field-aligned currents, and currents in the generator region. The generator dynamics are discussed and the appropriate value for the generator conductance is estimated. A model of auroral electrodynamics is described in which the generator and ionosphere are characterized by certain conductances, and in which the field-aligned current is related to the total potential drop by a linear relation which can be the result of single particle motions or nonlinear resistivity due to microscopic plasma processes. This model is applied both with a constant ionospheric conductivity and with a gradient in the conductivity to show differences between voltage and current generators. These steady-state results are compared with a time-dependent MHD model to show the effect of nonlinear resistivity and the Alfven conductance.
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