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We report experimental observation of an instability in a Couette-Taylor flowof a polymer fluid in a thin gap between two coaxially rotating cylinders in aregime where their angular velocity decreases with the radius while thespecific angular momentum increases with the radius. In the considered regime,neither the inertial Rayleigh instability nor the purely elastic instabilityare possible. We propose that the observed "elasto-rotational" instability isan analog of the magnetorotational instability which plays a fundamental rolein astrophysical Keplerian accretion disks.

Analog of Astrophysical Magnetorotational Instability in a Couette-Taylor Flow of Polymer Fluids