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) | |