Giant Solar Flare, "Spectacular" - NASA - 2012

SPECTACULAR EXPLOSION (UPDATED): 

Magnetic fields on the sun's northeastern limb erupted around 17:45 UT on April 16th, producing one of the most visually-spectacular explosions in years. NASA's Solar Dynamics Observatory recorded the blast at extreme ultraviolet wavelengths:

TO VIEW VIDEO of Photo above:

spaceweather.com/images April 16 2012

The explosion, which registered M1.7 on the Richter Scale of solar flares, was not Earth-directed, but it did hurl a CME into space. Analysts at the Goddard Space Weather have analyzed the trajectory of the cloud and found that it will hit NASA's STEREO-B spacecraft, the Spitzer space telescope, and the rover Curiosity en route to Mars. Planets Venus and Mars could also receive a glancing blow.

This event confirms suspicions that an active region of significance is rotating onto the Earth-facing side of the sun. Stay tuned for updates. Solar flare alerts: text, phone.

UPDATE: Using data from SDO, Steele Hill of NASA's Goddard Space Flight Center has assembled a must-see movie of the event. The movie shows the explosion unfolding at 304 Angstroms, a wavelength which traces plasma with a temperature around 80,000 K.

All this after this observation

What Does All this Mean?