  It has been suggested that the north-polar hexagon found on Saturn is an
unusual Rossby wave. If this is to be the case, one must not only explain how a
Rossby wave can be hexagonal in shape, albeit with curved corners, but also why
it is hexagonal rather than in the form of some other polygon. It is likely
that a spectrum of Rossby waves with different amplitudes and wavelengths
resulting from the velocity profile of the hexagonal jet is responsible for its
shape.
