Solar Tsunamis
Discovered in 1997 by the SOHO spacecraft end then confirmed in February 2009 per the two spacecraft STEREO that are filming the sun from two positions separated by 90 degrees, the solar tsunamis can reach 250km/second (560,000 mph), with an energy above 2400 megatons.
The html llink here below shows you in the NASA website an animation of a solar tsunami.
Photo credit & animation credit : NASA/Goddard Space Flight Center Conceptual Image Lab
Related web site: http://svs.gsfc.nasa.gov/vis/a010000/a010000/a010041/Tsunami.mpg