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IfP MAGE Midterm Meeting Report

IfP MAGE Midterm Meeting Report. Tilman Spohn. Milestones. Jan 2002 start of activities April 2002 first funding received May – August 2003 pre-doc student F. Schmidt (France) February 2004 post-Doc S. Ferrachat (France) May – August 2004 pre-doc student C. Gilman (France). Studies.

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IfP MAGE Midterm Meeting Report

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  1. IfP MAGE Midterm Meeting Report Tilman Spohn

  2. Milestones • Jan 2002 start of activities • April 2002 first funding received • May – August 2003 pre-doc student F. Schmidt (France) • February 2004 post-Doc S. Ferrachat (France) • May – August 2004 pre-doc student C. Gilman (France)

  3. Studies • Mars interior evolution, differentiation and magnetic field production • D. Breuer, F. Sohl, and T. Spohn • Europa and Ganymede evolution and magnetic field production • F. Schmidt, D. Breuer, and T. Spohn • Titan evolution and magnetic field production • C. Gilman, D. Breuer, and T. Spohn

  4. Publications BREUER, D. and T. SPOHN 2003. Early Plate Tectonics vs. Single-Plate Tectonics on Mars: Evidence From Magnetic Field History and Crust Evolution. J. Geophys. Res.108(E7), 5072, doi:10.1029/2002JE001999, 2003. SPOHN, T., D. BREUER, and P. LOGNONNE 2003. Comparative Planetology. Encyclopedia of Life Support Systems, (www.eolss.net), EOLSS 6-16-08-02. SOHL, F., H. HUSSMANN, B. SCHWENTKER, T. SPOHN, and R. T. LORENZ 2003. Interior structure models and tidal Love numbers of Titan. J. Geophys. Res., 108(E12), 5130, doi: 10.1029/2003JE002004, 2003. NAGEL, K., D. BREUER, and T. SPOHN 2004. A Model for the Interior Structure, Evolution and Differentiation of Callisto. Icarus, 169, 402 - 412. CONNERNEY, J.E.P., M.H. ACUNA, N.F. NESS, T. SPOHN, and G. SCHUBERT 2004. Mars crustal magnetism. Space Sci. Rev., 111, 1 – 32. DEHANT, V., P. LOGNONNE, C. SOTIN, J. – P. BARRIOT, J. J. BERTHELIER, J. – L. COUNIL, G. DELORY, R. JAUMANN, A. – M. HARRI, M. MENVIELLE, and T. SPOHN 2004. Netlander: A European mission to study the planet Mars. Planet. Space. Sci., in press. SCHUBERT, G., J. D. ANDERSON, T. SPOHN, and W. McKINNON 2004. Interior composition, structure and dynamics of the Galilean satellites. Submitted to the Jupiter Book of Arizona University Press, edited by F. Bagenal et al.

  5. Mars Thermal History EPT: Early Plate Tectonics STL: Stagnant Lid xx: log viscosit at 1600 K Breuer und Spohn, 2003

  6. Mars Magnetism • The most ancient units of the crust are magnetized • No remnant magnetization in the great impact basins • => the magnetizing field disappeared before the great impact basins formed, that is prior to ~4 Ga b.p.

  7. Magnetic field Thermal Evolution of the Martian Core No inner core! Breuer and Spohn, 2003

  8. Mars Conclusions • Plate tectonics is consistent with early magnetic field but not with the crust history • The present core cools conductively. No inner core is growing and the dynamo has ceased to operate.

  9. The Problem • If Ganymede has a self-sustained magnetic field, why not Io and Europa? • Io: tidal heating supplies significant amounts of power • Europa: should cool faster than Ganymede and may more easily freeze an inner core • Callisto is out. Apparently no iron core

  10. S, bouyant Fe solid Solid Fe-rich inner core

  11. Europa and Ganymede • Europa is probably significantly richer in a light alloying element (sulfur) than Ganymede and may therefore not have an iner core • Ganymede is likely to have an inner core which would explain ist present magnetic field

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