Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..643k&link_type=abstract
Lunar and Planetary Science, volume 27, page 643
Physics
6
Brine Oceans, Europa, Ganymede, Jupiter: Satellites, Magnetic Fields
Scientific paper
Salt water's electrical conductivity prompted us to investigate whether electromagnetic induction might occur in a salty ocean in Europa or Ganymede. An ocean could be detected in three ways. (1) Oceanic convection could induce electromagnetic fields or even an internal dynamo. (2) If brine reaches a moon's surface in electrical contact with ambient plasma, then a unipolar current, an induced magnetic field, and Alfven waves would be set up by Europa's motion through Jupiter's magnetic field. (3) Even if the ocean is electrically insulated from the plasma, Europa's motion through Jupiter's inclined, offset magnetic field causes the strength of the magnetic field sensed by Europa to oscillate by a factor of two every orbit; this would produce oscillatory electric and magnetic fields. Europa and Ganymede might have highly nondipolar, tilted, but very strong magnetic fields. _
Consolmagno Guy J.
Kargel Jeff S.
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