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)
||E meas/E (%)|
|From Z ij||From Z ij and E meas||From Z ij||From Z ij and E meas|
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