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

太空天气：非均匀导电地球中的感应电场和磁场：海岸效应

• 批准号: 0317868
• 负责人: Simon Shepherd
• 金额: $ 29.19万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0317868&HistoricalAwards=false
• 关键词: Space; Weather; Induced; Electric; Magnetic

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.

该提案的重点是增加我们对与海岸线相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地面磁力计的仪器偏差。PI调用了一种新的伪电流源技术，使分析超出了过去的有限元方法。 将研究、开发和应用他们计算空间风暴期间地球表面电场和磁场的新方法，称为“辅助源方法”，从而实现NSWP的目标。MAS允许一个更复杂的处理横向不均匀的地面电导率结构，如海洋-大陆边界。拟议的研究可通过将电离层与地面联系起来，为空间气象链提供一个重要环节。