Abstract
We report Alfvén-wave experiments with liquid rubidium at the Dresden High Magnetic Field Laboratory. Reaching up to 63T, the pulsed magnetic field exceeds the critical value of 54T at which the Alfvén speed coincides with the sound speed. At this threshold, we observe a period doubling of an applied 8kHz cw excitation, which is consistent with the theoretical expectation of a parametric resonance between magnetosonic waves and Alfvén waves. Similar mode conversions are discussed as a possible mechanism for heating the solar corona.
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