What is Solar Tsunami ?
Moreton waves propagate at a speed of 500-1500 km/s, and occur where a coronal magnetohydrodynamic fast-mode weak shock wave intersects the chromosphere according to a well-known theory of Yutaka Uchida that links them to radio type II bursts. Moreton waves can be observed primarily in the H band
The technical name is "fast-mode magnetohydrodynamical wave," or "MHD wave" for short. It could be up about 100,000 kilometers high, racing outward at 250 km/second (560,000 mph), and packed with energy as much as 2.4 million megatons of TNT (1029 ergs).
Solar tsunamis were discovered in 1997 by the Solar and Heliospheric Observatory (SOHO). In May 1997, a CME (a coronal mass ejection) came blasting up from an active region on the sun's surface, and SOHO recorded a tsunami rippling away from the blast site. When solar physicists first witnessed a towering wave of hot plasma racing across the sun's surface, they doubted their senses. The scale of the wave was staggering. It rose up higher than Earth itself and rippled out from a central point in a circular pattern millions of kilometers in circumference.The blast hur ...more