The Great White Spot, also known as Great White Oval, on Saturn, is a name given to storms that are large enough to be seen by telescope from Earth. The spots appear to be white, and the name was based on Jupiter's Great Red Spot. The spots can be several thousands of kilometers wide. Currently, a large band of white clouds called the Northern Electrostatic Disturbance (because of an increase in radio and plasma interference) has covered Saturn since 2010, and the Cassini orbiter is tracking the storm. Cassini information shows a loss of acetylene in the white clouds, an increase of phosphine, and an unusual temperature drop in the center of the storm. In April 2011, the storm had a second eruption. Scientists believe the white spots are made from ammonia ice pushed up by warmer gas through the tops of the planet's clouds.