文章基本信息

标题：Regional-scale high-latitude extreme geoelectric fields pertaining to geomagnetically induced currents
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作者：Antti Pulkkinen ; Emanuel Bernabeu ; Jan Eichner 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2015
卷号：67
期号：1
页码：1-8
DOI：10.1186/s40623-015-0255-6
出版社：Springer Verlag
摘要：Motivated by the needs of the high-voltage power transmission industry, we use data from the high-latitude IMAGE magnetometer array to study characteristics of extreme geoelectric fields at regional scales. We use 10-s resolution data for years 1993–2013, and the fields are characterized using average horizontal geoelectric field amplitudes taken over station groups that span about 500-km distance. We show that geoelectric field structures associated with localized extremes at single stations can be greatly different from structures associated with regionally uniform geoelectric fields, which are well represented by spatial averages over single stations. Visual extrapolation and rigorous extreme value analysis of spatially averaged fields indicate that the expected range for 1-in-100-year extreme events are 3–8 V/km and 3.4–7.1 V/km, respectively. The Quebec reference ground model is used in the calculations.
关键词：Geomagnetically induced currents ;Extreme events ;Spatial scales