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Table 3 Estimated absorbtion intensities for extreme events

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

Absorbtion intensity (dB) Once per year Once per 10 years Once per 100 years Once per 1000 years References
Long circuit χ = 0 and f = 6.6 MHz 71 83 93 100 Equation (10) Maeda and Inuki (1972)
Vertical χ = 0 and f = 6.6 MHz 71 130 210 320 Equation (2) Sato (1975)