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SUMMARY:GIC research at the Finnish Meteorological Institute: Untangling t
 he interaction between the geospace and the conducting ground
DTSTART:20260609T143000Z
DTEND:20260609T153000Z
DTSTAMP:20260617T094600Z
UID:indico-event-2215@indico.lip.pt
CONTACT:pbras@lip.pt\;psilva@uc.pt
DESCRIPTION:Speakers: Liisa Juusola (Finnish Meteorological Institute\, He
 lsínquia)\n\nGeomagnetically induced currents in grounded technological c
 onductor networks\, such as power grids\, are a common hazard at high lati
 tudes. Estimation of the geoelectric field that drives GIC requires 1) inf
 ormation on the driving external magnetic field variations\, 2) informatio
 n on the three-dimensional conducting ground\, and 3) a computationally fe
 asible method for calculating the geoelectric field. At the Finnish Meteor
 ological Institute\, we model the geoelectric field in Fennoscandia using 
 observations from a spatially dense magnetometer network\, a detailed 3-D 
 ground conductivity model\, and a physics-based induction simulation code.
  The modelled geoelectric field is provided to the local power grid operat
 or\, who can estimate GIC in their system without needing to share any cla
 ssified technical descriptions. While the available long time series of ge
 omagnetic observations provide valuable information on the drivers of geoe
 lectric field peaks\, they cannot yield information on extreme geomagnetic
  storms that have not yet occurred during the modern observational era. We
  have estimated the geoelectric field response to such an event using the 
 external geomagnetic variations from a physics-based geospace simulation o
 f the 1859 Carrington storm to drive our induction simulation. Our results
  indicate that peak geoelectric fields during a Carrington-level storm in 
 Fennoscandia could be roughly four to ten times stronger than those genera
 ted during the Halloween storm of 2003\, which was one of the strongest sp
 ace weather events of the last 100 years. Our future plans include similar
  modelling of the "perfect sudden commencement" as well as studying the tw
 o-way feedback between the ground and the ionosphere.\n\nhttps://indico.li
 p.pt/event/2215/
LOCATION:Sala de Conferências (Departamento de Física FCTUC)
URL:https://indico.lip.pt/event/2215/
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