Limits on an intrinsic dipole moment in Europa

Details Limits on an intrinsic dipole moment in Europa Limits on an intrinsic dipole moment in Europa

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....9285s&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #9285

Computer Science

Scientific paper

Galileo magnetometer data on four passes by Europa have been used to investigate whether a fixed permanent dipole moment is present in the interior of the moon. The data from several low altitude passes have been fitted to models of increasing complexity. The simplest models fit the measurements to internal constant multipoles, first through lowest order dipole and subsequently through second order quadrupole. Superimposing the permanent field with an induced magnetic dipole moment that is driven by the time variation of the external imposed magnetic field of Jupiter leads to better fits and strong reduction of the rms-error that characterizes the difference between the model and the data. The inductive response is found to be ˜ 87 % of the theoretical maximum inductive response for a highly conducting sphere. In the most ambitious model, the effect of plasma currents in the vicinity of Europa is taken into account by using a wire current model. In all the models a uniform magnetic field is used to describe the external field as a first order approximation. The full range of fits corresponding to the different assumptions noted show that the largest surface equatorial field caused by a fixed internal dipole moment is less then 50 nT. This should be compared with the magnitude of the induced field which can be of order 100 nT. Therefore, we conclude that the dipole coefficients of the intrinsic field contribute at most in a very minor way to the magnetic field.

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