Earth, Planets and Space

Table 1 The measured maximum and estimated 100-year and 200-year return levels at the Ebre Observatory

From: Assessing the hazard from geomagnetically induced currents to the entire high-voltage power network in Spain

Variable	Measured maximum	100-year return level	Confidence limit		200-year return level	Confidence limit
B _H	552	706	511	1,358	770	534	1,509
dB_H/dt	112	308	231	384	428	320	535
B _D	0.87	1.42	0.81	2.59	1.67	0.85	3.09
dB_D/dt	0.15	0.25	0.18	0.33	0.31	0.22	0.40

For the residual horizontal intensity B_H (in nT), the residual declination B_D (in degrees), and their derivatives (in nT/min and degrees/min, respectively); data are shown along with their 95% confidence limits.

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