GIC recordings in the Finnish natural gas pipeline - preliminary data

Note: GIC recordings were stopped on 23 Oct 2023.

Recordings of GIC are carried out close to the Mäntsälä compressor station in southern Finland.

Select the date:


Top panel: GIC at Mäntsälä as 10 s values (1-minute averages before 27 Feb 2023). The positive direction of the current is eastward.

Bottom panel: Time derivative of the geographic north component of the magnetic field at the Nurmijärvi Geophysical Observatory (about 40 kilometers westwards from Mäntsälä). -dX/dt correspond quite accurately the east component of the geoelectric field and thus GIC at Mäntsälä follows quite well -dX/dt.

Note: The quality of preliminary data has not been checked manually.

Plots are only for quick-look purposes. Before presenting the data anywhere and for a proper interpretation, contact Ari Viljanen (ari.viljanen(at)

GIC recordings are maintained by the Finnish Meteorological Institute, supported by Gasum Oy until December 2010. In March 2011 to February 2014, maintenance of recordings received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement no 260330 (EURISGIC).

Updated: 3 Nov 2023