Parameters and activity levels describing MOD and SEV level activity for shortwave fadeout (SWF), auroral absorption (AA), polar cap absorption (PCA), and post-storm maximum usable frequency depression (PSD) based on ICAO regulations (ICAO, 2019).
|SWF||Solar X-ray flux (0.1–0.8 nm wavelength) (Wm−2)||1 × 10−4 (X1)||1 × 10−3 (X10)|
|PCA||Absorption at 30 MHz (dB)||2||5|
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