During a magnetic storm, the induced geoelectric field drives induced currents that couple with artificial metallic networks such as power lines, pipelines, telecommunication cables and railway lines with the consequent risk, in case of strong events, of possible blackouts, damages and impairments of those systems. It is known that magnetic storms are global phenomena and their effects in specific regions with specific ground conductivity may be different; in particular, when a magnetic storm involves regions composed of two adjacent media characterized by very large difference of conductivity between them (e. g. sea and land) the induced geoelectric field is largely influenced by this conductivity contrast and depends, primarily, on its orientation with respect to the discontinuity line. By representing the source as an incident plane wave normally directed with respect to the air-land/sea interface, two kinds of polarizations are usually considered in literature: H/E polarization i.e. with the incident magnetic/electric field parallel to the discontinuity. In this paper, we wish to study a more general case i.e. when the source is characterized by an electric field forming a generic angle with the discontinuity line so that the resulting field is a combination of both H and E polarizations; to do this, and by adopting a 2D approach based on the generalized thin sheet model, the paper combines, published formulas for H polarization while new approximated analytic formulas for E polarization are derived. Moreover, we express the induced geoelectric field as a function of a generic direction which represents the layout orientation of a potentially affected plant (power line, pipeline…); this is important, because that is the first step necessary to evaluate the level of geomagnetically induced currents (GIC) in the plant itself. In conclusion, the novelty of this approach is that the resulting induced geoelectric field on the Earth’s surface can be expressed using only analytical formulas; a further advantage of the proposed approach to the problem is that it is quite simple and particularly suitable for the evaluation of GIC in terrestrial conductor networks.

Giovanni Lucca

Annals of Geophysics

ANNALS OF GEOPHYSICS 是一本国际性的、同行评议的、开放获取的在线期刊。地球物理学年鉴欢迎对地震学、大地测量学、火山学、地球物理学和化学、海洋学和气候学、地磁学和古地磁学、地球动力学和构造物理学、大气物理学和化学的初级研究做出贡献。它提供：- 开放获取，免费可在线访问（作者保留版权）-快速出版时间-由专家和实践研究人员进行同行评审-免费出版-表明质量和影响的出版后工具-全球媒体报道。地球物理学年鉴由 ISTITUTO NAZIONALE DI GEOFISICA E 出版VULCANOLOGIA (INGV)，非营利性公共研究机构。

The Annals of Geophysics is an international, peer-reviewed, open-access online journal. It welcomes contributions to preliminary research in the fields of seismology, geodesy, volcanology, geophysics and chemistry, oceanography and climatology, geomagnetism and paleomagnetism, geodynamics and tectonophysics, as well as atmospheric physics and chemistry. The journal offers: - Open access, freely available online (authors retain copyright) - Fast publication times - Peer review by experts and practitioners - Free publication - Post-publication tools to indicate quality and impact - Global media coverage. The Annals of Geophysics is published by the Istituto Nazionale di Geofisica e Vulcanologia (INGV), a non-profit public research institution.

《Annals of Geophysics》是一本国际性的、同行评议的开放获取在线期刊。该期刊欢迎对地震学、大地测量学、火山学、地球物理学与化学、海洋学与气候学、地磁学与古地磁学、地球动力学与构造物理学、大气物理学与化学等领域的初步研究贡献。期刊提供以下服务：- 开放获取，免费在线访问（作者保留版权）- 快速出版时间- 由专家和实践研究人员进行同行评审- 免费出版- 提供出版后工具以表明质量和影响- 全球媒体报道。《Annals of Geophysics》由意大利国家地球物理与火山研究所（INGV）出版，这是一个非营利性公共研究机构。

Category	Quartile
地球科学	4
地球科学, 地球化学与地球物理	4

Induced geoelectric field: influence of polarization in coast effect and proximity effect

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