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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
  1. 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.