Magnetoconvection dynamos and the magnetic fields of Io and Ganymede
Magnetoconvection dynamos and the magnetic fields of Io and Ganymede
复制标题
磁对流发电机以及木卫一和木卫三的磁场
DOI：
10.1126/science.276.5315.1106
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发表时间：
1997
期刊：
影响因子：
56.9
通讯作者：
G. Schubert
中科院分区：
文献类型：
--
作者：
G. Sarson;C. Jones;Keke Zhang;G. Schubert
伽利略轨道器的数据表明，木星的两个卫星，木卫一和木卫三，有内在的磁场。木星的磁场改变了产生这些内磁场的磁流体动力学过程的性质。在对流不能维持发电机的情况下，这种外加场允许产生可观的内部场。内部磁场的偶极矩可以与背景磁场对齐，就像木卫一和木卫三所观察到的那样。在没有木星磁场的情况下，木卫一可能不会有自我维持的内禀磁场;木卫三几乎可以肯定是以其自身的能力作为发电机运行的。
Data from the Galileo orbiter suggest that two of Jupiter’s moons, Io and Ganymede, have intrinsic magnetic fields. The magnetic field of Jupiter alters the nature of the magnetohydrodynamic processes generating these intrinsic fields. Such an imposed field allows appreciable internal fields to be generated in cases where convection cannot otherwise maintain a dynamo. The dipole moment of the internal field can then become aligned with the background field, as is observed for Io and Ganymede. Io might not have a self-sustained intrinsic field in the absence of the ambient jovian field; Ganymede is almost certainly operating as a dynamo in its own right.