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In the current-driven, kink-type Tayler instability (TI) a sufficientlystrong azimuthal magnetic field becomes unstable against non-axisymmetricperturbations. The TI has been discussed as a possible ingredient of the solardynamo mechanism and a source of the helical structures in cosmic jets. It isalso considered as a size limiting factor for liquid metal batteries. We reporton a liquid metal TI experiment using a cylindrical column of the eutecticalloy GaInSn to which electrical currents of up to 8 kA are applied. We presentresults of external magnetic field measurements that indicate the occurrence ofthe TI in good agreement with numerical predictions. The interference of TIwith the competing large scale convection, resulting from Joule heating, isalso discussed.

Experimental evidence for Tayler instability in a liquid metal column