NASA releases images of M-class solar flareApril 2, 2014 by Karen C. Fox in Astronomy & Space / Space Exploration
On April 2, 2014, the sun emitted a mid-level solar flare, peaking at 10:05 a.m. EDT, and NASA's Solar Dynamics Observatory captured imagery of the event. 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.
To see how this event may impact Earth, please visit NOAA's Space Weather Prediction Center at http://spaceweather.gov, the U.S. government's official source for space weather forecasts, alerts, watches and warnings.
This flare is classified as an M6.5 flare. M-class flares are ten times less powerful than the most intense flares, which are labeled X-class. The number after the M provides more information about its strength. An M2 is twice as intense as an M1, an M3 is three times as intense, etc.
Provided by NASA's Goddard Space Flight Center
"NASA releases images of M-class solar flare" April 2, 2014 http://phys.org/news/2014-04-nasa-images-m-class-solar-flare.html