X-Ray Flare Class
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In solar-terrestrial terms, rank of a flare based on its X-ray energy output. Flares are classified by the order of magnitude of the peak burst intensity (I) measured at the earth in the 1 to 8 angstrom band as follows:
Class Intensity (in Watts/m2) B I < 10-6 C 10-6 <= I < 10-5 M 10-5 <= I < 10-4 X I >= 10-4
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 Background, X-Ray Burst