ESA/SWWT: Ground Effects Topical Group (GETG)

Spokesman: Risto Pirjola

Summary :

At the Earth’s surface, space weather manifests itself as geoelectromagnetic effects. Geomagnetic activity is increased, i.e. the geomagnetic field becomes disturbed, in other words, a geomagnetic storm occurs. The geoelectric field drives currents, called geomagnetically induced currents (GIC), in man-made conductors, such as electric power transmission systems, oil and gas pipelines, telecommunication cables and railway equipment. GIC may cause problems to the systems: transformers can be saturated, pipelines may suffer from enhanced corrosion, and telecommunication and railway systems can experience overvoltage.

Activities:
  • Modelling the occurrence of geomagnetic variations and geoelectric fields during space weather events
  • Modelling GIC in electric power systems (discrete grounding)
  • Modelling GIC in buried pipeline networks (continuous grounding)
  • Measurements of geomagnetic variations, geoelectric fields and GIC
  • Development of forecast techniques of GIC based on neural networks or on physical models
  • Collaboration with power and pipeline industry on GIC research
  • Advice on and forecast of geomagnetic activity to users, such as oil drilling and prospecting industry and aeromagnetic survey enterprises
Group Members
Miscellaneous
Meetings
The ESA Space Weather Team (SWWT)
M. Wik & R. Pirjola - Thu, Feb 3, 2005