First Estimations of Geomagnetically Induced Currents in the South of Portugal
Abstract Geomagnetic storms induce electric fields in the conducting Earth, which are the source of geomagnetically induced currents (GICs) in grounded power lines. In this study, we compute time‐varying geoelectric fields induced in the southern region of the Portuguese mainland at the time of the...
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| Format: | Article |
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Wiley
2021-01-01
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| Series: | Space Weather |
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| Online Access: | https://doi.org/10.1029/2020SW002546 |
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| author | Joana Alves Ribeiro Fernando J. G. Pinheiro Maria Alexandra Pais |
| author_facet | Joana Alves Ribeiro Fernando J. G. Pinheiro Maria Alexandra Pais |
| author_sort | Joana Alves Ribeiro |
| collection | DOAJ |
| description | Abstract Geomagnetic storms induce electric fields in the conducting Earth, which are the source of geomagnetically induced currents (GICs) in grounded power lines. In this study, we compute time‐varying geoelectric fields induced in the southern region of the Portuguese mainland at the time of the strongest geomagnetic storms during solar cycle 24, using a plane‐wave approximation. The driving geomagnetic storm signals are obtained from series recorded at the Coimbra magnetic observatory. Magnetotelluric impedance tensors used to compute the induced electric field are obtained using a conductivity model that takes into account general features of the local lithology and the proximity to the sea. The first GIC simulations for Portugal are presented, using data from the national high voltage power network. Starting with an a priori standard uniform electric field to compute electromotive forces, we first assess the susceptibility of the power system network given only its topology and resistance parameters. For real storms, we report (i) the clustering of the horizontal geomagnetic time variation around the northwest‐southeast direction, (ii) the simulation of the effect of the western and southern coastlines of the territory over the induced electric field, and (iii) the spotting of the substations most sensitive to storms in the studied region. |
| format | Article |
| id | doaj-art-73a7ac2ede6844d8b408dbf45e8f2789 |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-73a7ac2ede6844d8b408dbf45e8f27892025-01-14T16:27:00ZengWileySpace Weather1542-73902021-01-01191n/an/a10.1029/2020SW002546First Estimations of Geomagnetically Induced Currents in the South of PortugalJoana Alves Ribeiro0Fernando J. G. Pinheiro1Maria Alexandra Pais2CITEUC, Department of Physics University of Coimbra Coimbra PortugalCITEUC, Department of Physics University of Coimbra Coimbra PortugalCITEUC, Department of Physics University of Coimbra Coimbra PortugalAbstract Geomagnetic storms induce electric fields in the conducting Earth, which are the source of geomagnetically induced currents (GICs) in grounded power lines. In this study, we compute time‐varying geoelectric fields induced in the southern region of the Portuguese mainland at the time of the strongest geomagnetic storms during solar cycle 24, using a plane‐wave approximation. The driving geomagnetic storm signals are obtained from series recorded at the Coimbra magnetic observatory. Magnetotelluric impedance tensors used to compute the induced electric field are obtained using a conductivity model that takes into account general features of the local lithology and the proximity to the sea. The first GIC simulations for Portugal are presented, using data from the national high voltage power network. Starting with an a priori standard uniform electric field to compute electromotive forces, we first assess the susceptibility of the power system network given only its topology and resistance parameters. For real storms, we report (i) the clustering of the horizontal geomagnetic time variation around the northwest‐southeast direction, (ii) the simulation of the effect of the western and southern coastlines of the territory over the induced electric field, and (iii) the spotting of the substations most sensitive to storms in the studied region.https://doi.org/10.1029/2020SW002546Geomagnetic stormsGICs modeling3D conductivity modelsSouth of Portugal |
| spellingShingle | Joana Alves Ribeiro Fernando J. G. Pinheiro Maria Alexandra Pais First Estimations of Geomagnetically Induced Currents in the South of Portugal Space Weather Geomagnetic storms GICs modeling 3D conductivity models South of Portugal |
| title | First Estimations of Geomagnetically Induced Currents in the South of Portugal |
| title_full | First Estimations of Geomagnetically Induced Currents in the South of Portugal |
| title_fullStr | First Estimations of Geomagnetically Induced Currents in the South of Portugal |
| title_full_unstemmed | First Estimations of Geomagnetically Induced Currents in the South of Portugal |
| title_short | First Estimations of Geomagnetically Induced Currents in the South of Portugal |
| title_sort | first estimations of geomagnetically induced currents in the south of portugal |
| topic | Geomagnetic storms GICs modeling 3D conductivity models South of Portugal |
| url | https://doi.org/10.1029/2020SW002546 |
| work_keys_str_mv | AT joanaalvesribeiro firstestimationsofgeomagneticallyinducedcurrentsinthesouthofportugal AT fernandojgpinheiro firstestimationsofgeomagneticallyinducedcurrentsinthesouthofportugal AT mariaalexandrapais firstestimationsofgeomagneticallyinducedcurrentsinthesouthofportugal |