在 EPRI SUNBURST 监测网络内出现的大型地磁诱导电流

IF 3.7 2区 地球科学
Space Weather Pub Date : 2023-12-08 DOI:10.1029/2023sw003532
Chigomezyo M. Ngwira, Robert Arritt, Charles Perry, James M. Weygand, Rishi Sharma
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引用次数: 0

摘要

空间天气是一种自然灾害,可对人类技术资产造成不利影响。高压输电网是易受空间天气驱动的地磁感应电流(GICs)影响的最关键技术系统之一。研究美国大陆地磁场感应电流的主要挑战之一是地磁场感应电流测量数据的可用性,这对于验证地电场和电力流模型等至关重要。在本研究中,我们分析了在美国 17 个电力研究所 (EPRI) SUNBURST 变压器位置收集到的 GIC 测量数据,这些位置记录的 GIC 值达到或超过 10 A。该数据集包括 2010 年至 2021 年期间 Kp 指数为 6 及以上的 52 个地磁暴。分析证实,每年的地磁暴数量与记录的 GIC 事件数量之间存在良好的相关性。我们的结果还显示,在排名前 17 位的 GIC 事件中,约 76% 与风暴主阶段有关,只有 24% 与风暴突然开始有关。此外,研究还首次表明,中纬度正海湾会在美国大陆上空造成大的 GIC。最后,这项研究表明,数据集中测量到的最大 GIC 事件与局部强烈的 dB/dt 结构有关,这可归因于亚暴活动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Occurrence of Large Geomagnetically Induced Currents Within the EPRI SUNBURST Monitoring Network
Space weather, a natural hazard, can adversely impact human technological assets. High-voltage electric power transmission grids constitute one of the most critical technological systems vulnerable to space weather driven geomagnetically induced currents (GICs). One of the major challenges pertaining to the study of GICs over the continental United States has been the availability of GIC measurements, which are critical for validation of geoelectric field and power flow models, for example. In this study, we analyze GIC measurements collected at 17 Electrical Power Research Institute (EPRI) SUNBURST transformer locations across the United States for which a GIC value of 10 A or greater was recorded. This data set includes 52 individual geomagnetic storms with Kp index 6 and above during the period from 2010 to 2021. The analysis confirms that there is a good correlation between the number of geomagnetic storms per year and the number of recorded GIC events. Our results also show that about 76% of the top 17 GIC events are associated with the storm main phase, while only 24% are attributed to storm sudden commencements. In addition, it is shown, for the first time, that mid-latitude positive bays can cause large GICs over the continental United States. Finally, this study shows that the largest measured GIC event in the data set was associated with a localized intense dB/dt structure, which could be attributed to substorm activity.
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