On Aug. 24, 2014, the sun emitted a mid-level solar flare, peaking at 8:16 a.m. NASA's Solar Dynamics Observatory and STEREO captured images of the flare, which erupted on the left side of the sun. 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, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel. Must Watch this video. Well, it' not harmful but if the intensity increases there are some effects, to know more go here.
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On May 13, 2013, an X2.8-class flare erupted from the sun -- the strongest flare of 2013 to date. This NASA image shows a close-up of the flare as seen by the Solar Dynamics Observatory in the 131 angstrom wavelength.