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Equivalent overhead current profile at Quebec magnetic longitude throughout 01:00 to 10:00 UT on 13 March 1989 in the format of Figure 6. The overhead current intensity scales are the same for the two figures. Substorm magnetic gradients steeper than 5 nT/s (interpolated at Quebec longitude) are shown by the white diamonds. PCN index values are displayed by the solid black curve. The black triangle marks the time of power outage.
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