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The magnetic dichotomy of the Galilean satellites Europa and Ganymede

Breuer, D. und Hussmann, H. und Spohn, T. (2008) The magnetic dichotomy of the Galilean satellites Europa and Ganymede. European Geosciences Union - General Assembly, 2008-04-13 - 2008-04-18, Vienna (Austria).

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Offizielle URL: http://www.cosis.net/abstracts/EGU2008/07511/EGU2008-A-07511.pdf

Kurzfassung

One of the most surprising discoveries of the Galileo mission was the detection of a self- generated magnetic field in the vicinity of Ganymede. Up to that discovery, it was widely believed that Ganymede did not fully differentiate and had a central region composed of silicates and iron and an outer ice layer. The existence of the self-generated magnetic field together with the relatively small value of the momentof- inertia factor, suggests that Ganymede is strongly differentiated into an iron core, a silicate mantle and an outer ice layer. Based on Galileo gravity field measurements, a similar interior structure has been proposed for Europa where an internal magnetic field is absent. It has been suggested that chemical convection due to the precipitation of iron or iron sulfide is the most likely mechanism to power a present-day dynamo on Ganymede. Chemical convection and dynamo action will start as soon as core temperatures fall below the liquidus temperature of the core alloy and operates as long as the core is cooling. Interestingly, although Ganymede is about 700 km larger in radius than Europa, the differences in size and mass of the silicate and iron part, respectively, are only small for both satellites. As a consequence, one would expect a similar thermal and magnetic field evolution in both cases. However, thermal evolution models indicate that it is even more likely for Europa to generate an internal field if the same set of parameter values for mantle rheology and radioactive heat source density is used as for Ganymede. We will discuss two scenarios that may help explain the puzzling magnetic dichotomy between both satellites: (1) a larger content of light elements in the core of Europa as compared to Ganymede and (2) tidal heating in the silicate mantle of Europa.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:The magnetic dichotomy of the Galilean satellites Europa and Ganymede
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Breuer, D.NICHT SPEZIFIZIERT
Hussmann, H.NICHT SPEZIFIZIERT
Spohn, T.NICHT SPEZIFIZIERT
Datum:April 2008
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:10
Name der Reihe:Geophysical Research Abstracts
Status:veröffentlicht
Stichwörter:Galilean satellites; Ganymede; Europa; magnetic field; dynamo; mantle convection; tidal heating
Veranstaltungstitel:European Geosciences Union - General Assembly
Veranstaltungsort:Vienna (Austria)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2008-04-13 - 2008-04-18
Veranstalter :European Geosciences Union
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Vergleichende Planetologie (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetenphysik
Hinterlegt von: Stefanie Hempel
Hinterlegt am:29 Apr 2008
Letzte Änderung:27 Apr 2009 14:54

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