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Calculated hourly Dst values (black and red solid lines) for the 1859 storm for different assumed values of solar wind B (B2) at the leading edge of the CME. The light blue line is the hourly-averaged Colaba H-trace, with the dashed horizontal black line giving the pre-event baseline. The dashed vertical lines indicate the assumed arrival time of the shock and the leading edge of the driving interplanetary CME. (Adapted from Siscoe et al. 2006, with permission from Elsevier.)
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