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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