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- Title
Galileo magnetometer measurements: a stronger case for a subsurface ocean at Europa.
- Authors
Kivelson, M G; Khurana, K K; Russell, C T; Volwerk, M; Walker, R J; Zimmer, C
- Abstract
On 3 January 2000, the Galileo spacecraft passed close to Europa when it was located far south of Jupiter's magnetic equator in a region where the radial component of the magnetospheric magnetic field points inward toward Jupiter. This pass with a previously unexamined orientation of the external forcing field distinguished between an induced and a permanent magnetic dipole moment model of Europa's internal field. The Galileo magnetometer measured changes in the magnetic field predicted if a current-carrying outer shell, such as a planet-scale liquid ocean, is present beneath the icy surface. The evidence that Europa's field varies temporally strengthens the argument that a liquid ocean exists beneath the present-day surface.
- Publication
Science (New York, N.Y.), 2000, Vol 289, Issue 5483, p1340
- ISSN
0036-8075
- Publication type
Journal Article
- DOI
10.1126/science.289.5483.1340