旋转潮汐畸变球中椭圆不稳定性引起的磁场
Magnetic field induced by elliiptical instability in a rotating tidally distorded sphere
摘要：
人们通常认为，地球或更普遍的其他行星的地球发电机是由熔融核心内的对流流体运动产生的。然而，这种热对流或成分对流的替代方案可以在这些行星最终的进动或其液体核心可能的潮汐扭曲所产生的惯性波共振中找到。本文将回顾我们的一些实验工作，致力于椭圆不稳定性和提出一些新的结果时，实验流体是液态金属。我们特别表明，施加的磁场是扭曲的自旋模式所产生的椭圆形不稳定性。在我们的实验中，磁场很弱（20高斯），洛伦兹力与惯性力相比可以忽略不计，因此磁场不会改变流体流动，并且通过磁场测量恢复了不稳定性的纯流体动力学增长率。
英文摘要：
It is usually believed that the geo-dynamo of the Earth or more generally of other planets, is created by the convective fluid motions inside their molten cores. An alternative to this thermal or compositional convection can however be found in the inertial waves resonances generated by the eventual precession of these planets or by the possible tidal distorsions of their liquid cores. We will review in this paper some of our experimental works devoted to the elliptical instability and present some new results when the experimental fluid is a liquid metal. We show in particular that an imposed magnetic field is distorted by the spin- over mode generated by the elliptical instability. In our experiment, the field is weak (20 Gauss) and the Lorenz force is negligible compared to the inertial forces, therefore the magnetic field does not modify the fluid flow and the pure hydrodynamics growth rates of the instability are recovered through magnetic measurements.
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