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Table 1

Maximum peak-to-peak electric fields for the Halloween 2003 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′/E percentages are the magnitudes of quantities estimated using 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′/E (%)
From Z ij From From Z ij From
Line 1 127 5.151 5.105 654 648 99
Line 2 92 2.265 2.177 208 200 96
Line 3 67 2.704 2.297 181 154 85
Line 4 93 7.226 5.599 672 521 77
Line 5 198 5.467 4.751 1082 941 87
Line 6 109 4.744 4.461 517 486 94
Line 7 75 3.357 0.862 252 65 26
Line 8 94 3.254 2.349 306 221 72
Line 9 58 5.150 5.019 299 291 97
Line 10 106 2.991 2.787 317 295 93
Line 11 85 3.698 3.254 314 277 88
Line 12 79 2.464 2.274 195 180 92

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