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Left (a)–(f): Superposed epoch analysis of magnetometer data from Inukjuak QC and EHD from the Tilly substation in the Hydro-Québec network (median values in bold black). Superposed epoch trigger is the negative Bz extremum for the 50 largest negative Bz impulsive events. Median SMU (red) and SML (blue) for these 2-h windows are shown in the bottom panel. Individual EHD traces are colorized in d, median values shown in e. Right (g)–(l): Inukjuak QC magnetometer readings for equivalent SME periods at the Bz extrema, and corresponding median EHD values at the Tilly substation. All SME values have been minimum EHD subtracted for each two-hour period. Events without HD data from Tilly were not used (5 of 50 events).
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