'Encore Bursts'
Storms in the Sun
Many storms erupting from the surface of the sun last longer and are more powerful than thought, new research shows. Scientists had regarded solar flares as dramatic one-off events that blaze up and die down in due course. But about 15 percent of them have a second distinct peak of strong energy emission minutes or hours later, and this encore burst often outshines the first, scientists using NASA's Solar Dynamics Observatory (SDO) spacecraft have observed. The discovery is expected to lead to better space weather forecasts.
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