地面和卫星观测中三维地球和行星电磁感应效应的时域模拟
Time-Domain Modeling of Three-Dimensional Earth's and Planetary Electromagnetic Induction Effect in Ground and Satellite Observations
摘要：
时变磁层和电离层电流系统在导电行星内部感应的电流对电磁场观测有重要影响。由于行星三维（3-D）电气结构和感应电流系统的空间复杂性之间的非线性相互作用，很难完全表征EM感应效应。我们提出了一个通用的框架，在异质导电行星的3-D电磁感应效应的时域建模。我们的方法不假设磁场是潜在的，允许行星内电导率的任意分布，并且可以处理空间复杂的时变电流系统。该方法适用于在固定观测站点和卫星平台上测量的数据，并能够在近实时设置中计算3-D EM感应效应。
英文摘要：
Electric currents induced in conductive planetary interiors by time-varying magnetospheric and ionospheric current systems have a significant effect on electromagnetic (EM) field observations. Complete characterization of EM induction effects is difficult owing to non-linear interactions between the three-dimensional (3-D) electrical structure of a planet and spatial complexity of inducing current systems. We present a general framework for time-domain modeling of 3-D EM induction effects in heterogeneous conducting planets. Our approach does not assume that the magnetic field is potential, allows for an arbitrary distribution of electrical conductivity within a planet, and can deal with spatially complex time-varying current systems. The method is applicable to both data measured at stationary observation sites and satellite platforms, and enables the calculation of 3-D EM induction effects in near real-time settings.
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