A flare bursts from the Sun in this detailed image taken on August 1, 2010, by the STEREO Ahead telescope.
Image of the Day Heat
Fiery arcs rise above an active region on the surface of the Sun in this pair of images of a coronal mass ejection on January 27, 2010.
Image of the Day Atmosphere
On January 23, 2012, satellites observed the most powerful solar radiation storm since 2005.
Image of the Day Heat Unique Imagery
NASA's newest sun-monitoring mission captures a detailed view of a prominence erupting on March 30, 2010.
Image of the Day Heat Remote Sensing
Our Sun experienced fewer sunspots in 2008 than it had since the 1957 launch of Sputnik. As of Sun-Earth Day on March 20, 2009, the Sun was continuing its quiet pattern.