Emerging sunspot releases mid-level solar flareAugust 20, 2012 By Karen C. Fox in Astronomy & Space / Space Exploration
(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.
What is a solar flare?
For answers to this and other space weather questions, please visit the Spaceweather Frequently Asked Questions page.
Provided by NASA
"Emerging sunspot releases mid-level solar flare" August 20, 2012 http://phys.org/news/2012-08-emerging-sunspot-mid-level-solar-flare.html