Leveraging Legacy Broadband Magnetotelluric Data for Geoelectric Field Hazard Assessment in Southern Italy

The repository contains two types of electromagnetic data used in this study to investigate geomagnetic storm-time magnetic and geoelectric field variability in southern Italy: (i) two ASCII files (#1.txt and #2.txt) containing time series for two major geomagnetic storms that occurred in 2024, and (ii) two compressed archives (#3.zip and #4.zip) containing raw magnetotelluric (MT) time series acquired at the permanent GARG monitoring station on the Gargano Promontory, Italy. #1 and #2 provide time series of the horizontal components of the magnetic field (in nanoteslas, nT) recorded at the Italian permanent geomagnetic observatory of Duronia (DUR), together with synchronous geoelectric field measurements (in millivolts per kilometer, mV/km) recorded at the GARG station. The time series have a temporal resolution of 1 s and cover two intense geomagnetic storms: the “Gannon” event of May 2024, included in #1, spanning 10 May 2024 to 13 May 2024, and a subsequent major storm in October 2024, included in #2, spanning 10 October 2024 to 13 October 2024. #1 and #2 are structured with the following columns: Bx: north–south magnetic field component (nT), recorded at DUR By: east–west magnetic field component (nT), recorded at DUR Ex: north–south electric field component (mV/km), recorded at GARG Ey: east–west electric field component (mV/km), recorded at GARG In addition, the repository includes two compressed archives, #3 and #4, containing raw MT time series acquired at the GARG station. These data are provided as examples of the raw MT recordings used in the processing workflow underlying the impedance tensor estimation presented in the study, and correspond to acquisitions collected at different original sampling rates. #3 contains MT time series acquired at 32 Hz from 21 May 2024 to 21 July 2024. #4 contains MT time series acquired at 512 Hz on 11 April 2024. Each compressed archive includes a metadata/control file in .xml format and binary ATS files containing electric and magnetic field recordings for both the north–south and east–west components.本研究用于探究意大利南部磁暴期间磁场与地电场变化特征的数据集包含两类电磁数据，存储于本仓库中：(i) 两个ASCII格式文件（#1.txt与#2.txt），内含2024年两次强地磁暴的时间序列数据；(ii) 两个压缩归档文件（#3.zip与#4.zip），包含意大利加尔加诺半岛GARG永久监测站采集的原始大地电磁（magnetotelluric, MT）时间序列数据。 #1.txt与#2.txt提供了意大利杜罗尼亚（Duronia, DUR）永久地磁观测台记录的磁场水平分量时间序列（单位：纳特斯拉，nT），以及GARG站同步采集的地电场测量数据（单位：毫伏每千米，mV/km）。该时间序列的时间分辨率为1秒，覆盖两次强地磁暴事件：#1.txt包含2024年5月10日至5月13日的“Gannon”磁暴事件，#2.txt则包含后续2024年10月10日至10月13日的一次强磁暴事件。 #1.txt与#2.txt的列结构如下： Bx：杜罗尼亚观测台（DUR）记录的南北向磁场分量（单位：nT） By：杜罗尼亚观测台（DUR）记录的东西向磁场分量（单位：nT） Ex：GARG站记录的南北向电场分量（单位：mV/km） Ey：GARG站记录的东西向电场分量（单位：mV/km） 此外，本仓库还包含两个压缩归档文件#3.zip与#4.zip，内含GARG站采集的原始大地电磁时间序列数据。这些数据作为本研究阻抗张量估算处理流程中所用原始MT记录的示例，对应不同原始采样率的采集数据集。其中#3.zip包含2024年5月21日至7月21日以32 Hz采样率采集的MT时间序列数据；#4.zip包含2024年4月11日以512 Hz采样率采集的MT时间序列数据。 每个压缩归档文件均包含一个.xml格式的元数据/控制文件，以及存储南北向与东西向电场、磁场分量记录的二进制ATS文件。