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- In solar-terrestrial terms, a daily average background X-ray flux in the 1 to 8 angstrom range. It is a midday minimum designed to reduce the effects of flares.
NOAA National Weather Service - Cite This Source - This Definition
- burst, Centimeter Burst, Cosmic Ray, Microwave Burst, Radio Emission, Riometer, Type I, II, III, IV, U Burst, X-Ray Burst, X-Ray Flare Class