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首页> 外文期刊>Earth, planets and space: EPS >3-D electromagnetic induction studies using the Swarm constellation: Mapping conductivity anomalies in the Earth's mantle
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3-D electromagnetic induction studies using the Swarm constellation: Mapping conductivity anomalies in the Earth's mantle

机译：使用Swarm星座的3D电磁感应研究：绘制地球地幔中的电导率异常

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An approach is presented to detect deep-seated regional conductivity anomalies by analysis of magnetic observations taken by low-Earth-orbiting satellites. The approach deals with recovery of C-responses on a regular grid and starts with a determination of time series of external and internal coefficients of the magnetic potential. From the coefficients, time series of the magnetic vertical component and of the horizontal divergence of the horizontal components are synthesized oil the grid and the C-responses are determined by means of signal processing of the corresponding time series. For validation of the approach, 3 years of realistic synthetic data at Simulated orbits of the forthcoming Swarm constellation of 3 satellites have been used. To obtain the synthetic data for a given 3-D conductivity Earth's model a time-domain scheme has been applied which relies oil a Fourier transformation of the inducing field, and oil a frequency domain forward modelling. The conductivity model consists of a thin Surface layer of realistic conductance and a 3-D mantle that incorporates a hypothetic deep regional anomaly beneath the Pacific Ocean plate. To establish the ability of the approach to capture the geometry of the mantle heterogeneities used in the forward approach. numerical experiments have been undertaken using various satellite combinations, sampling periods of the resulting time series, and numbers of internal coefficients. The possibility of the approach to map anomalies in the mantle using satellite data that contain contributions from the core and lithosphere, from the rnagnetosphere and ionosphere (and their Earth-induced counterparts), as well as payload noise has been investigated. The model Studies have shown that C-responses obtained oil a regular grid might be used to map regional deep-seated conductivity anomalies. Moreover, it has been demonstrated that these C-responses are successfully recovered from magnetic data collected by the proposed Swarm constellation of 3 satellites.
机译：提出了一种通过分析低地球轨道卫星的磁观测来检测深层区域电导率异常的方法。该方法处理规则网格上C响应的恢复，并从确定磁势的外部和内部系数的时间序列开始。根据这些系数，可以在网格上合成磁垂直分量的时间序列和水平分量的水平散度的时间序列，并通过相应时间序列的信号处理来确定C响应。为了验证该方法，已经使用了3年即将来临的3颗卫星群的模拟轨道上的现实合成数据。为了获得给定3D电导率地球模型的合成数据，已采用时域方案，该方案依赖于感应场的傅立叶变换，而依赖于频域正向建模。电导率模型由一个现实电导的薄表层和一个3-D地幔组成，该地幔合并了太平洋板块下方的假设性深部区域异常。建立该方法的能力，以捕获前向方法中使用的地幔异质性的几何形状。已经使用各种卫星组合，所得时间序列的采样周期以及内部系数的数量进行了数值实验。已经研究了使用卫星数据绘制地幔异常的方法的可能性，这些卫星数据包含核心和岩石圈，核层和电离层（及其地球感应的对应物）以及有效载荷噪声的贡献。模型研究表明，使用规则网格获得的C响应可用于绘制区域深层电导率异常图。此外，已经证明，这些C响应可从拟议的3颗Swarm星座所收集的磁数据中成功恢复。

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