On the control of magnetospheric convection by the spatial distribution of ionospheric conductivities

Details On the control of magnetospheric convection by the spatial distribution of ionospheric conductivities On the control of magnetospheric convection by the spatial distribution of ionospheric conductivities

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..261s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 261-284. Research supported by the Centre National d

Physics

169

Convective Flow, Ionospheric Conductivity, Magnetospheric Instability, Atmospheric Models, Auroras, Electric Fields, Electron Precipitation, Electrostatics, Field Aligned Currents, Magnetosphere-Ionosphere Coupling, Plasma Dynamics, Solar Wind, Spatial Distribution, Time Response

Scientific paper

Using the linear approximation of the motions of the magnetospheric ring current inner edge, a self-consistent, semianalytical model is developed of its coupling to the ionosphere via field-aligned currents, its reaction to an externally imposed dawn-to-dusk potential drop across the magnetospheric cavity, and its effect on the shielding of convection electric field from midlatitudes. The spatial distribution of ionospheric conductivities by two equivalent impedance matrices is described on the basis of a reduction of the magnetospheric, ionospheric, and field-aligned current equations to matrix formulas. This formalism is then used to include in the circuit the two main categories of large-scale conductivity gradients: the latitudinal gradient due to the enhancement of auroral zone conductivities by electron precipitation, and the local time and latitudinal gradients produced by solar illumination at middle and low latitudes.

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