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The magnetic field and internal structure of Ganymade

机译：木卫三的磁场和内部结构

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BEFORE the recent fly-bys of. Ganymede by the Galileo spacecraft, viable models of the internal structure of Jupiter's largest moon ranged from a uniform mixture of rock and ice to a differentiated body with a rocky core and an icy mantle. Analysis ofthe Doppler shift of radio signals from Galileo has now shown that Ganymede is strongly differentiated with a relatively dense core surrounded by a thick shell of ice. Other instruments have revealed that Ganymede has an intrinsic magnetic field, whichis aligned approximately antiparallel to Jupiter's magnetic field. Here we argue that these results imply that Ganymede has an outer silicate core surrounding a liquid (or partially liquid) inner core of iron or iron sulphide, and that the magnetic fieldis generated by dynamo action within this metallic core. lo also appears to have an intrinsic magnetic field (antiparallel to that of Jupiter), implying that it too has a metallic core in which the field is generated either by dynamo action or by magnetoconvection. ;
机译：在最近飞过之前。木星最大的卫星内部结构的可行模型是由伽利略号航天器（Galymede）制作的，范围从岩石和冰的均匀混合物到具有岩石核和冰冷地幔的分化物体。现在，对来自伽利略的无线电信号的多普勒频移的分析表明，木卫三的特征很明显，它的核心相对较密，被厚厚的冰壳包围。其他仪器也显示，木卫三具有一个固有磁场，该磁场与木星磁场近似反平行。在这里，我们认为这些结果表明木卫三有一个外部硅酸盐核，围绕着铁或硫化铁的液体（或部分液体）内核，并且磁场是由该金属核内的发电机作用产生的。 lo似乎也具有本征磁场（与Jupiter的磁场平行），这暗示它也具有金属核，该磁场通过发电机作用或磁对流产生。 ;

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