(Phys.org) -- On August 17, the sun emitted a mid-level flare, peaking at 9:02 PM EDT. Solar flares are gigantic bursts of radiation that cannot pass through Earth's atmosphere to harm humans on the ground, however when strong enough they can disrupt GPS and communications signals.
The flare is classified as an M5.6 class flare. M-class flares can cause brief radio blackouts at the poles and minor radiation storms that might endanger astronauts.
Emerging sunspot releases mid-level solar flare (2012, August 20)
retrieved 21 July 2019
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Emerging sunspot releases mid-level solar flare