The sun emitted a significant solar flare, peaking at 5:12 p.m. EST on Nov. 5, 2013. 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.
Fuente : http://www.eurekalert.org/pub_releases/2013-11/nsf...
Fuente : http://www.eurekalert.org/pub_releases/2013-11/nsf...