Nowcasting Geoelectric Fields in Ireland using Magnetotelluric Transfer Functions.

Geomagnetically induced currents (GIC) driven by geoelectric fields pose a hazard to ground-based infrastructure, such as power grids and pipelines. Here, new method is presented for modelling in near real time, provide valuable information help mitigate the impact of GIC. The uses magnetic field measurements from Magnetometer Network Ireland (MagIE; https://www.magie.ie ), interpolates geomagnetic variations between magnetometers using spherical elementary current systems (SECS), estimates local electric high-density (< 40 km) network magnetotelluric transfer functions (MT-TF) encompassing island. model was optimised work with correction curve applied time series. This approach successfully validated measured at four sites number storms, providing accurate up 1-minute delay high coherence (0.70 – 0.85) signal-to-noise ratio (SNR; 3.2 6.5) relative validation comparable standard non-real-time (coherence = 0.80 − 0.89 SNR 4.0 7.0). galvanic distortion on also briefly evaluated, leading more homogeneous representation direction field, regional scale.