Radio Event
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- Flares with Centimetric Bursts and/or definite Ionospheric Event (SID)
NOAA National Weather Service - Cite This Source - This Definition - Active, ACTV, Chromospheric Events, Eruptive, Geophysical Events, High Energy Event, Polar Cap Absorption (PCA), proton, Quiet, Short Wave Fade (SWF), sudden ionospheric disturbance (SID)