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Table 2

Maximum peak-to-peak electric fields for the September 2017 magnetic storm averaged (see Methods Sect. 2.2) in directions delineated by the 12 high-voltage (HV) transmission lines shown in Figure 1 and their associated transmission-line voltages. E meas are the measured electric fields (Simpson & Bahr, 2020a, 2020b) from sites ACH, ELC, CAI, TAN, MAR, LEA and RAN. E meas/ E percentages are the magnitudes of quantities estimated with E meas substituted from the aforementioned 7 sites relative to those estimated using Z ij .

Line number (Fig. 1) Length (km) Maximum electric field averaged along HV line (V/km)
Voltage (V)
E meas/E (%)
From Z ij From Z ij and E meas From Z ij From Z ij and E meas
Line 1 127 0.769 0.774 98 98 101
Line 2 92 0.390 0.453 36 42 116
Line 3 67 0.458 0.410 31 27 90
Line 4 93 0.709 1.182 66 110 167
Line 5 198 0.640 0.764 127 151 119
Line 6 109 0.713 0.680 78 74 95
Line 7 75 0.260 0.241 20 18 93
Line 8 94 0.510 0.513 48 48 101
Line 9 58 0.955 0.932 55 54 98
Line 10 106 0.325 0.315 34 33 97
Line 11 85 0.774 0.772 66 66 100
Line 12 79 0.491 0.518 39 41 105

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