The bright clouds immediately to the south and east of this oval substantially change their appearance in periods as short as 4 hours. The second dark spot, at lower right edge, revolves around Neptune every 16 hours. This Voyager 2 image has been processed to obtain true color balance. The processing allows both the clouds' structure in the dark regions near the pole and the bright clouds east of the Great Dark Spot to be reproduced. These and other features suggest waves are present in the atmosphere and play a large role in the type of clouds that are visible.
Rings are narrow, and contain concentrations of particles called ring arcs.