Mapping Ganymede's time variable aurora in the search for a subsurface ocean

Details Mapping Ganymede's time variable aurora in the search for a subsurface ocean Mapping Ganymede's time variable aurora in the search for a subsurface ocean

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12244s&link_type=abstract

HST Proposal ID #12244. Cycle 18

Physics

Scientific paper

A very exciting, unresolved question about JupiterÕs moon Ganymede is whether Ganymede harbors a saline subsurface water ocean under its icy crust. A saline, electrically conductive water ocean will modifiy Ganymede's magnetic field enviorment and thus also the locations of Ganymede's northern and southern auroral ovals. Without an ocean, Ganymede's auroral ovals will rock by ~10 degrees towards and away from Jupiter within 5.25 hours. However, with an ocean the shift will be up to only ~4 degrees. We propose two visits of five consecutive STIS orbits at eastern elongation to monitor and resolve with sufficient precision the shift in locations of Ganymede's auroral ovals to determine wheter an ocean is present on Ganymede. Addressing this question is timely as NASA/ESA are planing a Jupiter system mission including a Ganymede orbiter with the objective to characterize Ganymede as potential habitat.;

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