Speaker
Description
Our Sun starts processes with a strong impact on Earth’s magnetosphere that can cause strong magnetospheric and ionospheric perturbations. This can lead to the creation of intense fast-changing magnetospheric and ionospheric current systems, which provoke strong and fast fluctuations in the geomagnetic field. Time-varying magnetic fields interact with the Earth’s conductivity, resulting in an induced electric field on the surface, known as the geoelectric field. This interaction can generate Geomagnetically Induced Currents (GICs) on the ground and within critical human infrastructure, posing a risk of damage to power lines.
GICs strongly depend on the ground conductivity. Sweden has large spatial variations and complexity in the underlying ground conductivity structure across the country. In order to better understand GICs and for the identification of the worst-case scenarios for Swedish power transmission lines, 3D simulations are essential.
We present results from our 3D time-domain simulations with 3D high-resolution ground electrical conductivity model. Our simulation framework uses various ionospheric current systems as input instead of the often-used magnetic field in the form of plane waves. This novel approach allows us to study the direct effect of the particular ionospheric current systems (position, orientation, 3D spatial and temporal profile) on the geoelectric field and consequently on GICs in power transmission lines.
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