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Table 1

List of examined magnetic storm intervals and maxima in H and dH/dt.

Storm period Max dH [nT]
Max dH/dt [nT/s]
Power line cuts OMNI SW data
ABK LOV BFE ABK LOV BFE
13–14 Jul 1982 3155 5381 4036 26.3 44.8 24.0 14 reports no
8–9 Feb 1986 2727 2117 1093 17.0 21.1 9.7 5 reports no
13–14 Mar 1989 2139 3007 2969 20.9 11.6 32.8 9 reports no
6–7 Apr 2000 771 1315 1260 4.9 7.2 9.9 no reports yes
15–16 Jul 2000 1450 1252 1250 5.5 6.6 10.5 no reports yes
29–30 Oct 2003 3695 2423 1686 21.3 11.1 10.1 Malmö outage no

Note. For the three selected observatories, the maxima in the total horizontal component, H = (X2 + Y2)½, and the time derivative, dH/dt = ((dX/dt)2 + (dY/dt)2)½, are emphasized in bold letters.

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