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Science 16 May 1997:
Vol. 276. no. 5315, pp. 1106 - 1108
DOI: 10.1126/science.276.5315.1106
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Reports

Magnetoconvection Dynamos and the Magnetic Fields of Io and Ganymede

G. R. Sarson, C. A. Jones, K. Zhang, G. Schubert

Data from the Galileo orbiter suggest that two of Jupiter's moons, Io and Ganymede, have intrinsic magnetic fields. The magnetic field of Jupiter alters the nature of the magnetohydrodynamic processes generating these intrinsic fields. Such an imposed field allows appreciable internal fields to be generated in cases where convection cannot otherwise maintain a dynamo. The dipole moment of the internal field can then become aligned with the background field, as is observed for Io and Ganymede. Io might not have a self-sustained intrinsic field in the absence of the ambient jovian field; Ganymede is almost certainly operating as a dynamo in its own right.

G. R. Sarson, C. A. Jones, K. Zhang, Department of Mathematics, University of Exeter, Exeter EX4 4QE, UK.
G. Schubert, Department of Earth and Space Sciences, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095, USA.

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