These Voyager images of Saturn's clouds are in false color in order to enhance the contrast between the different bands which are in reality quite similar in color. The cloud features are less colorful than Jupiter's because the cloud layers of lie deeper in the atmosphere. This is the result of colder temperatures at Saturn: in order for ammonia, for example, to form clouds it must be at a certain temperature and this temperature is found at a lower altitude on Saturn than on Jupiter. A wide range of cloud systems exist in Saturn' atmosphere. Several persistent symmetric white, brown, and red ovals have been observed at various latitudes and are believed to be a product of mixing methane, ammonia, and sulphur. Atmospheric bands colored yellow, brown, and black are the result of molecules, which were destroyed by ultraviolet sunlight and violent lightening, being mixed together by Saturn's dynamic weather patterns. The red band is probably produced by phosphine. Two main atmopsheric belts, the North (latitude +20 degrees) and South (latitude -20 degrees) Equatorial Belts, are always visible, and aurorae are common between 78 and 80 degrees latitude in both hemispheres. The major cloud features in Saturn's northern hemisphere are the Brown spot (1,500 km in diameter) and Big Bertha (the largest spot, measuring 10,000 by 6,000 km). Saturn's southern hemisphere features Anne's Spot (5,000 by 3,000 km).
