Continental scale modelling of geomagnetically induced currents Ari Viljanen, Risto Pirjola, Magnus Wik, Antal Ádám, Ernö Prácser, Yaroslav Sakharov and Juri Katkalov J. Space Weather Space Clim., 2 (2012) A17 Published online: 28 September 2012 DOI: 10.1051/swsc/2012017