Observational Constraints on Theories of the Geodynamo

国际地球物理研究所将继续进行调查，旨在加深对长期变化的运动学和动力学的了解，寻求为地球发电机理论提供有用的约束。这项工作在很大程度上是以核-地幔边界磁场随时间变化模型的形式使用观测数据为基础的。具体的关注领域包括：1.确定地核顶部的流体流动模式；2.正演模拟技术，以提供对所观察到的磁场现象的简单解释，并检查核心和下地幔中特定物理过程的重要性；3.研究短周期的长期变化，特别是寻找岩心中的波状现象；4.研究成分对流的动力学，以及在岩心表面附近可能形成稳定层的可能性。

The PI will continue investigations aimed at furthering understanding of the kinematics and dynamics of the secular variation, seeking to provide useful constraints on theories of the geodynamo. This work is largely based on the use of observations in the form of a time-varying model of the magnetic field at the core-mantle boundary. Specific areas of attention include: 1. the determination of the pattern of fluid flow at the top of the core; 2. forward modeling techniques to provide simple explanations of observed phenomena in the magnetic field, and to examine the importance of particular physical processes in the core and lower mantle; 3. investigation of the short-period secular variation and especially the search for wave-like phenomena in the core; 4. examination of the dynamics of compositional convection, and possible growth of a stable layer near the core surface.