Magnetic Signature of a Polar Pass Over Io

Physics

Scientific paper

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6030 Magnetic Fields And Magnetism, 6050 Plasma And Mhd Instabilities, 6055 Surfaces And Interiors, 6218 Jovian Satellites

Scientific paper

On August 6, 2001, Galileo flew by Io on a low altitude polar orbit, one well suited for determining whether the moon has an internally generated magnetic field. At the time of submission of this abstract, only very low temporal resolution data samples have been received on the ground. Close to Io, the preliminary data appear to exclude internal fields with surface field strengths greater than about 200 nT. Higher resolution data to be returned in August-September 2001 will more accurately constrain this estimate. Field perturbations extending far from Io are consistent with expectations for interaction with an extended cloud of pickup ions. Ion cyclotron wave power in the full resolution data will give information on the distribution of and composition of these pickup ions. Comparisons with previous passes at different latitudes, local times, and positions relative to the flowing torus plasma will be of particular interest. The magnetic signature in the wake of the flow is much weaker on the I31 pass than it was on the lower latitude J0 pass in December of 1995 and we will discuss possible reasons for the differences.

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