Analysis of Large Geomagnetically Induced Currents During the 7-8 September 2017 Storm: Geoelectric Field Mapping

Abstract

A new 10s resolution GeoElectric Dynamic Mapping (GEDMap) procedure was developed to study Geomagnetically Induced Currents (GICs).• The modeling results performed using the geomagnetic field mapping and Mäntsälä GIC measurements are in excellent agreement. • Rapid and strong evolution of the geoelectric fields occurred at and near Mäntsälä during the two largest GIC events of the magnetic storm.