Characterization of experimental dynamos

Details Characterization of experimental dynamos Characterization of experimental dynamos

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.142...52p&link_type=abstract

Geophysical Journal International, Volume 142, Issue 1, pp. 52-58.

Astronomy and Astrophysics

Astronomy

13

Dynamos, Experiments, Liquid Sodium, Rotating Convection

Scientific paper

Laboratory models of geophysical magnetic field production require new experi-mental characterization methods. Self-generating liquid metal magnetic dynamos are explored using two new experiments. Kinematic dynamo studies lead us to charac-terize the magnetic field dynamics in terms of eigenvalues and eigenfrequencies of the induction equation. Observing the decay of magnetic field pulses indicates the real part of the leading eigenvalue of the induction equation, while a chirp magnetic field diagnoses the imaginary part of the eigenvalue. Finally, a single-frequency applied magnetic field characterizes the structure of the velocity field. These measurements provide a new means to characterize and measure the approach to self-generation. We present data from numerical simulations and laboratory experiments using these techniques.

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