Detailed View of a Solar Eclipse Corona

Explanation: Only in the fleeting darkness of a total solar eclipse is the light of the solar corona easily visible. Normally overwhelmed by the bright solar disk, the expansive corona , the sun's outer atmosphere , is an alluring sight. But the subtle details and extreme ranges in the corona's brightness, although discernible to the eye, are notoriously difficult to photograph. Pictured here , however, using multiple images and digital processing, is a detailed image of the Sun's corona taken during the 2008 August total solar eclipse from Mongolia . Clearly visible are intricate layers and glowing caustics of an ever changing mixture of hot gas and magnetic fields . Bright looping prominences appear pink just above the Sun's limb . A similar solar corona might be visible through clear skies in a thin swath across the USA during a total solar eclipse that occurs just one week from tomorrow .

Citizen Science: How to participate during the Aug. 21 eclipse.