Fig. 5


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Upper panel: calculated GIC at the Huutokoski 400 kV station using data of 30 October 2003, assuming the Finnish grid model in 1978–1979, the conductivity map of Figure 2, and using spherical geometry. Lower panel: difference in GIC by spherical and planar methods. Note the different scales on the vertical axes. A positive GIC flows into the earth.

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