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A basal magma ocean dynamo to explain the early lunar magnetic field

机译:基础岩浆海洋发电机解释早期的月球磁场

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摘要

The source of the ancient lunar magnetic field is an unsolved problem in the Moon's evolution. Theoretical work invoking a core dynamo has been unable to explain the magnitude of the observed field, falling instead one to two orders of magnitude below it. Since surface magnetic field strength is highly sensitive to the depth and size of the dynamo region, we instead hypothesize that the early lunar dynamo was driven by convection in a basal magma ocean formed from the final stages of an early lunar magma ocean; this material is expected to be dense, radioactive, and metalliferous. Here we use numerical convection models to predict the longevity and heat flow of such a basal magma ocean and use scaling laws to estimate the resulting magnetic field strength. We show that, if sufficiently electrically conducting, a magma ocean could have produced an early dynamo with surface fields consistent with the paleomagnetic observations. (C) 2018 Elsevier B.V. All rights reserved.
机译:古老的月球磁场的来源是月球进化中的一个未解决的问题。 调用核心发电机的理论工作已经无法解释观察到的字段的大小,而是下降一到两个数量级。 由于表面磁场强度对发电机区域的深度和大小非常敏感,因此我们假设月初月发电机在由早期农历海洋的最终阶段形成的基础岩浆海洋中的对流驱动; 这种材料预计将是密集的,放射性和金属的。 在这里,我们使用数值对流模型来预测这种基础岩浆海洋的寿命和热流,并使用缩放规律来估计所产生的磁场强度。 我们表明,如果足够电导地,岩浆海洋可能会产生具有与古磁性观测的表面场的早期发电机。 (c)2018年elestvier b.v.保留所有权利。

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