Modeling the ion loss effect on the generation of region 2 field-aligned currents via equivalent magnetospheric conductances

Details Modeling the ion loss effect on the generation of region 2 field-aligned currents via equivalent magnetospheric conductances Modeling the ion loss effect on the generation of region 2 field-aligned currents via equivalent magnetospheric conductances

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815467p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A9, p. 15,467-15,476.

Physics

2

Earth Magnetosphere, Field Aligned Currents, Magnetosphere-Ionosphere Coupling, Plasma-Particle Interactions, Solar Terrestrial Interactions, Convection, Ionospheric Conductivity, Mathematical Models

Scientific paper

Vasyliunas (1972) showed that, for steady state lossless ion convection in the inner magnetosphere, the effects of region 2 field-aligned currents generated by the pressure gradients of the magnetospheric plasma could be represented by an equivalent magnetospheric Hall conductance Ci. We examine in the framework of a linearized fluid theory how ion losses modify the formalism introduced by Vasyliunas. The equivalent magnetospheric Hall conductance Ci is decreased and a new term Cr is added to the Sigma(phi-phi) component of the ionospheric conductance tensor Sigma. An evaluation of this new term shows that the eastward rotation of the convection potential pattern induced by Ci is reduced and that Cr contributes to a nonnegligible part of the shielding effect. The effect of the field-aligned currents on the magnetospheric convection is reproduced up to first order in the linear formalism. The linear formalism presents a simple way to include the effects of region 2 field-aligned currents into models of ionospheric electrodynamics for steady state conditions.

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