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Table 1 Event detection criteria for SWF duration analysis

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

Criteria (#) Event detection criteria
dfmin Additional
(i) ≥ 2.5 MHz Day time LT (05 h–19 h), flare ≥ C1 class
(ii) ≥ 3.5 MHz
(iii) “B” (Black out)