Details of the Abstract
| Title of paper | Magnetic field induced by convective flow in Europa's subsurface ocean |
| List of authors | Šachl, L., Kvorka, J., Čadek, O., Velímský, J. |
| Affiliation(s) | Department of Geophysics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic |
| Summary | The electromagnetic (EM) methods played a crucial role in detecting the subsurface oceans in the interior of Europa, Callisto, and Ganymede. On Europa, the time-varying primary magnetic field generated by Jupiter induces a secondary magnetic field, which was measured by the Galileo probe at the synodic period. The comparison with the numerically modeled secondary field indicates that Europa's shell is conductive, which supports the presence of highly conductive salty sea water in the subsurface ocean. In that case, the ocean flow generates an additional magnetic field, the so-called ocean-induced magnetic field (OIMF), which has been overlooked so far. A notable exception is the study of Vance et al (2021). They predicted the OIMF ≤ 20 nT using a simplified scaling relation in which they inserted typical values of the primary field, electrical conductivity, and flow velocity according to the flow model of Soderlund (2019). Here, we revisit their results using a full EM induction solver. Besides, we rely on our flow model to systematically study the geometry estimates proposed for Europa. |
| Session Keyword | 8.0 Global, planetary and source field studies |
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