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(a) Sum of GIC divided by the number of nodes in the Nordic power grid at 18–24 UT on 30 October 2003 as 1-min values, (b) horizontal electric field at UPS, (c) time derivative of the horizontal magnetic field (|dH/dt|) at UPS. 30-min maximum values are plotted as blue asterisks at the midpoints of each 30-min period of 18:00–18:29, 18:30–18:59, etc.
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