On May 13, 2013, the sun emitted an X2.8-class flare which was the strongest X-class flare of 2013 so far. X2.8-class flare is associated with a coronal mass ejection, or CME, another solar phenomenon that can send billions of tons of solar particles into space. It can possibly affect electronic systems in satellites and on the ground. Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, but if it's strong enough; it may disturb the atmosphere in the layer where GPS and communications signals travel. This disrupts the radio signals for as long as the flare is ongoing.
Article: First X-Class Solar Flares of 2013
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