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May 14 flare
2013 is currently at the solar maximum, which is the most active part of the sun's 11-year cycle of solar flare activity.
Solar flares erupt with tremendous heat, but don't worry; it dissipates before reaching Earth. But they can temporarily alter the upper atmosphere and create memorable disruptions. Your GPS could send you to the wrong location.
NASA's Solar Dynamics Observatory captured this image of the X1.2 class solar flare on May 14.