Session CD8 - Measuring and modelling geoelectric fields for GIC studies

Juliane Huebert (British Geological Survey, UK), Joana Alves Ribeiro (University of Coimbra, Portugal), Ciaran Beggan (British Geological Survey, UK)

Large geoelectric fields are induced by variations of the geomagnetic field over a range of periods from seconds to minutes particularly during severe space weather events. Accurate representation of the geoelectric field is vital for correctly estimating Geomagnetically Induced Currents (GICs) in grounded technologies. The geoelectric field can be measured directly using magnetotelluric methods for example or inferred using large-scale conductivity properties of the subsurface. At present, there is a general lack of high-quality data and models specifically for space weather applications. In this session, methods for measuring and modelling the geoelectric field are examined, including new 1D/3D models of conductivity, data collection methodology or resources. We also solicit talks on improvements in real-time modelling of the geoelectric field over wide areas and new techniques for using space weather forecasts to estimate extreme geoelectric values.