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From New Scientist - Latest Headlines:
A blast wave swept across the face of the Sun on Wednesday, ripppling outward from the site of a large solar flare. Blast waves that spread all the way across the Sun like this one did are rare, especially when the Sun is in the quiet phase of its 11-year cycle, as it is right now.
The wave was imaged by the Optical Solar Patrol Network telescope at the National Solar Observatory (NSO) in Sunspot, New Mexico, US. Watch a video of the expanding blast wave. The wave compresses and heats the solar plasma as it passes, causing it to brighten.
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