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Table 1.

Solar cycle 24 geomagnetic storms during which GIC was measured in the neutral of the Itumbiara 500 kV transformer (see Figure 1). The three storms that produced GIC amplitudes above 4 A are shown in bold face.

Year Day/Month NOAA’s Storm Level Dst (nT)
2010 20/01 > G1 −34
04–05/04 G4 −61
01–02/05 G2 −71
28–29/05 G1 −80
03–05/08 G2 −74
23–25/08 > G1 44
11/10 > G1 −75
2011 06–07/01 G1 −42
04–05/02 G2 −63
26–28/05 G2 −80
05–06/08 G4 −115
09/09 G2 −72
17/09 G2 −69
26/09 G2 −118
24–25/10 G3 −147
2012 22–24/01 G1 −67
07/03 G2 −74
08–09/03 G4 −131
12/03 G2 −40
15/03 G2 −72
23/04 G2 −95
16/06 G2 71
15/07 G3 −127
03–04/09 G2 −74
30/09 > G1 −41
08–09/10 G3 −105
12–14/11 G2 −108
2013 17/03 G3 −131
01/06 G3 −119
29/06 G2 −98
02/10 G4 67
08/10 G2 61

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