Collaborative Research: Global Conductivity by Spatiotemporal Analysis

EAR-0087643地幔电导率的横向变化提供了对地幔对流、俯冲板块的命运、地幔羽流的分布以及从上地幔到下地幔过渡带的性质的洞察。传统上研究地幔电导率的方法是利用永久地磁观测站时间序列的傅里叶分析得到的频域响应函数。然而，这种方法受到稀疏和地理上不规则的观测站分布的限制。磁性卫星记录了持续的时空磁波动，提供了克服这一限制的机会，因为它们完全对地球进行采样。研究人员建议开发一种时间域3D球面地球感应代码，并使用MAGSAT和Oersted卫星的数据来研究上地幔电导率的3D变化。

EverettEAR-0087643Lateral variations in mantle electrical conductivity provide insight into mantle convection, the fate of subducting slabs, the distribution of mantle plumes, and the nature of the transition zone from upper to lower mantle. Mantle electrical conductivity traditionally has been studied using frequency-domain response functions derived from Fourier analysis of permanent geomagnetic observatory time series. This method is limited however by the sparse and geographically irregular observatory distribution. Magnetic satellites, which record continuous spatiotemporal magnetic fluctuations, offer an opportunity to overcome this limitation since they sample the globe completely. The investigators have proposed to develop a time-domain 3D spherical Earth induction code and use data from the MAGSAT and Oersted satellites to investigate 3D variations in upper mantle electrical conductivity.