Waves the size of the United States are breaking on the sun.

"The wave-forming process taking place on the surface of the Sun is the same as that which takes place in the Earth's oceans. It's known as a Kelvin-Helmholtz instability, and involves two different fluids flowing past each other. Off the beach, the air flows past the sea and rapidly turns tiny ripples into mighty swells and breakers: on the surface of the sun, plasma erupts in mighty spouts, so becoming less dense, and then blows across the surface of non-erupted plasma to create waves just like those of Earth - only much, much bigger and hotter."

From The Register.