This is a drawing depicting the motions in earth's atmosphere.
Click on image for full size
Image from: Random House Atlas
Motions in Neptune's Interior
Motions in the interior of a planet helps to carry heat from the core to the planet's surface.
The drawing to the left illustrates a kind of global motion that is typical of motions in the atmosphere as well as the interior of a planet. Material rises from where it is warmest, and moves in a roiling motion like the boiling of a pot. The material eventually cools enough to sink again. In the drawing, there are three different cells of activity in the atmosphere where the air turns over (depicted by red sheets).
In the interior of Neptune, the ice layers are warm enough to move in this fashion. Some scientists think, however, that the interior of Neptune may have a different sort of motion.
The magnetosphere of Neptune seems to be produced by motions in the icy layers inside Neptune. More study is needed in order to decide exactly what kind of motion Neptune has.
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