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We present a numerical study of stability of two-layer isolated vortices on the f-plane with respect to normal modes, i.e. disturbances with harmonic dependence on the azimuthal angle and time. Two types of vortices are considered: compensated vortices (for which the lower-layer is at rest), and vortices with uniform potential vorticity in the lower layer (for which a weak co-rotating circulation...
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