Evidence of a Global Magma Ocean in Io Revealed by Electromagnetic Induction

Details Evidence of a Global Magma Ocean in Io Revealed by Electromagnetic Induction Evidence of a Global Magma Ocean in Io Revealed by Electromagnetic Induction

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p53b..06k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P53B-06

Physics

[6063] Planetary Sciences: Comets And Small Bodies / Volcanism, [6218] Planetary Sciences: Solar System Objects / Jovian Satellites, [6219] Planetary Sciences: Solar System Objects / Io

Scientific paper

Galileo made five successful flybys of Io during which it collected field and particle data from the satellite’s vicinity. We have reanalyzed the magnetic field data obtained from these flybys to assess the contributions of permanent and induced magnetic fields in the observations. We performed 3-D MHD simulations of the interaction of Io with Jupiter’s magnetosphere to determine magnetic perturbations caused by the satellite/plasma interactions. Our reanalysis of the difference data (observations - MHD perturbations) shows that a strong electromagnetic induction signature is present in the magnetic field observations. We have modeled the difference data using a three-layer model of Io consisting of a perfectly conducting core, a finite conductivity mantle and a non-conducting crust. The modeling results show that a global subsurface conductor is required at depths below 50 km to explain the magnetic field observations. We further show that a conducting core cannot produce the signature observed and that the response requires a conducting layer much closer to the surface. The high conductivity required of the subsurface conductor can only be explained by hypothesizing the presence of a subsurface magma ocean in Io. Finally, we place upper limits on the strengths of the dipolar and quadrupolar harmonics of the permanent internal field.

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