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First results of a new spherical Couette experiment are presented. The liquidmetal flow in a spherical shell is exposed to a homogeneous axial magneticfield. For a Reynolds number Re=1000, we study the effect of increasingHartmann number Ha. The resulting flow structures are inspected by ultrasoundDoppler velocimetry. With a weak applied magnetic field, we observe anequatorially anti-symmetric jet instability with azimuthal wave number m=3. Asthe magnetic field strength increases, this instability vanishes. When thefield is increased further, an equatorially symmetric return flow instabilityarises. Our observations are shown to be in good agreement with linearstability analysis and non-linear flow simulations.

Transitions in a magnetized quasi-laminar spherical Couette Flow