That level of activity-caused by solar flares and 'coronal mass ejections' or CMEs on the sun's surface-doesn't just bring a burst of colorful auroras into view. It also has an impact on the power grid, satellites, GPS, and radio communications.
Solar flares are bursts of radiation from sunspots. They may be accompanied by CMEs, which are clouds of plasma and magnetic fields that are hurled into space from the sun's surface.
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