U Burst
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- In solar-terrestrial terms, a fast radio burst spectrum of a flare. It has a U-shaped appear- ance in an intensity-vs.-frequency plot
NOAA National Weather Service - Cite This Source - This Definition - burst, Centimeter Burst, Cosmic Ray, Microwave Burst, Radio Emission, Riometer, Type I, II, III, IV, X-Ray Background, X-Ray Burst, X-Ray Flare Class