Space Weather: Induced Electric and Magnetic Fields in a Non-Uniformly Conducting Earth: Coastal Effects

这项建议侧重于增加我们对与海岸线有关的电导率梯度附近的地磁感应电流(GIC)的理解。这项工作将解决由于这些梯度结构而造成的地面磁力计的仪器偏差问题。PI调用了一种新的伪电流源技术，使分析超越了过去的有限元方法的范围。他们计算空间风暴期间地球表面电场和磁场的新方法，被称为“辅助源法”(MAS)，将被研究、开发和应用，从而达到NSWP的目标。MAS允许对横向不均匀的地面传导性结构进行更复杂的处理，例如海洋-大陆边界。拟议的研究可以通过将电离层与地面相耦合，在空间气象链中提供一个重要的环节。

This proposal focuses on increasing our understanding of Geomagnetically Induced Currents (GICs) near conductivity gradients associated with coastlines. The effort will address the instrumental biases of ground magnetometers due to these gradient structures. The PIs invoke a novel pseudo-current source technique to allow analysis beyond the reach of past finite element methods. Their new method for calculating the electric and magnetic fields at the Earth's surface during space storms, called the "method of auxiliary sources" (MAS), will be investigated, developed, and applied, thus meeting the goals of the NSWP. MAS allows a more sophisticated treatment of laterally non-uniform ground conductivity structures, such as ocean-continent boundaries. The proposed research could provide an important link in the space weather chain by coupling the ionosphere to the ground.