Figure 1
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SuperMAG activity indices SMU and SML during the most intense phases of three geomagnetic storms. From top: 13–14 Jul 1982, 13–14 Mar 1989, 29–30 Oct 2003. Black arrows indicate the times of the power grid impacts mentioned in the text. On 13–14 Jul 1982, the smallest value of SML is −4714 nT, and the largest value of SMU is 2131 nT.
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