Evidence of a global subsurface magma ocean in Io from Galileo's magnetometer observations

Details Evidence of a global subsurface magma ocean in Io from Galileo's magnetometer observations Evidence of a global subsurface magma ocean in Io from Galileo's magnetometer observations

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..751k&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.751

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Theoretical models of tidal dissipation in Io's interior have provided support for a global melt layer in the interior of Io. The extremely high temperature of the lava erupting on Io's surface also hint at an extremely hot interior consistent with an internal magma ocean but no direct evidence has been available. Using Jupiter's rotating magnetic field as a sounding signal, we report evidence of a strong dipolar electromagnetic induction signature in Galileo's magnetometer data from four different flybys. The signal is consistent with electromagnetic induction from large amounts of rock-melts in the asthenosphere of Io. Modeling of this signature shows that the induction response from a completely solid mantle model is inadequate to explain the magnetometer observations. However, we find that a layer of asthenosphere > 50 km in thickness with a rock melt fraction ≥ 20% is adequate to accurately model the observed magnetic field. This work also places a stronger upper limit of 107 nT on the permanent equatorial surface dipole field that could be generated by a dynamo inside Io.

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