P. Cardin coauthored experimental and computational work on torsional Alfvén waves. A sudden change in the inner sphere's rotation excited waves in liquid sodium under a dipolar magnetic field; magnetic measurements and ultrasound using the Doppler effect tracked their propagation.[ref]
Torsional Alfvén waves in a dipolar magnetic field: experiments and simulations by Z. Tigrine and others. Author list, Summary and §2: DTS-Ω spherical-shell apparatus, inner-sphere jerk, magnetic probes and ultrasound Doppler measurements.
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