Predicting ground geoelectric field using magnetospheric model and 3d conductivity model of Earth

We present a numerical scheme for modeling the effect of space weather on ground geoelectric field which takes into account the 3-dimensional distribution of Earth's conductivity. The scheme involves two steps: 1) Using a magnetohydrodynamic model of the magnetosphere coupled to an electrostatic model of the ionosphere, we compute the external magnetic field source (in the form of equivalent currents) that is responsible for a specific geomagnetic disturbance. 2) Solving the induction equations for a given source from step 1 and given 3-dimensional conductivity model of the Earth. We implement a scheme to compute geoelectric and magnetic fields during Halloween storm (2003-10-29) and discuss the results.