Thanks for the link Metricyard, it explains it all a lot better than I could and clears up some of my own misconceptions. What they are researching is the secondary magnetic field on Europa and the tidal effects on the proposed circulating subsurface salt water layer caused by the primary magnetic source on Jupiter.

Not wanting to hijack this thread - since it's so tightly constrained to the threat to Huygens - but is there any further news on that model for Europa?

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