Cyclostrophic vortices in polar regions of rotating planets

Multi-petal, rotating vortices can form in two-dimensional flows consisting of an inviscid incompressible fluid under certain conditions. Such vortice s are principally nonlinear thermo-hydrodynamical structures. The proper ro tation of these structures which leads to time-dependent variations of the associated temperature field can be enregistred by a stationary observer. T he problem is analyzed in the framework of the contour dynamics method (CDM ). An analytical solution of the reduced equation for a contour curvature i s found. We give a classification of the solutions and compare the obtained results with observational data.