Red spot of Jupiter and the drift soliton in a plasma

A simplified Rossby wave equation is derived. The solution of this equation is found in the form of a steady-state, isolated vortex that travels along the parallel with a velocity that is higher than the Rossby velocity. The solution has a resemblance to the red spot of Jupiter. The obtained vortex is compared with the drift-convective, isolated vortices in an inhomogeneous plasma.