Testing the electrodynamic method to derive height-integrated ionospheric conductances

Abstract. We have used empirical models for electric potentials and the magnetic fields both in space on ground to obtain maps of height-integrated Pedersen Hall ionospheric conductivities at high latitudes. This calculation required use “curl-free” “divergence-free” components currents, with former obtained from that are a model field-aligned currents. The second component is equivalent current, usually associated derived ground-level field. Conductances were calculated varying combinations interplanetary field (IMF) magnitude orientation angle, as well dipole tilt angle. results show reversing sign Y IMF produces substantially different conductivity patterns. largest dawn side upward, Region 2 Low strengths Harang discontinuity lead inconclusive near midnight. Calculations Joule heating, compared Poynting flux space. some differences, while their integrated totals match within 1 %. Some enters polar cap dissipated heating auroral ovals, where greater.