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Table 2 Estimated duration for extreme events

From: Statistical analysis of short-wave fadeout for extreme space weather event estimation

Duration of event (h) Once per year Once per 10 years Once per 100 years Once per 1000 years Reference
dfmin ≥ 2.5 MHz 1.6 3.6 6.8 11.9 Figure 7 ionosonde
dfmin ≥ 3.5 MHz 1.1 2.9 6.1 11.5 Figure 7 ionosonde
“B”-event 0.63 1.8 4.0 7.4 Figure 7 ionosonde