Risk Assessment of the Ground Magnetic Response to the March and April 2023 Geomagnetic Storms Using Geomagnetically Induced Currents Indices

Amaechi, P.O.; Messanga, H.; Grodji, F.O.; Akala, A.; Despirak, I.; Ngwira, C.M.; Oyeyemi, E.; Amory‐Mazaudier, C.

Авторы: Amaechi Paul O., Messanga Honore, Grodji Frank O., Akala Andrew, Despirak Irina, Ngwira Chigomezyo M., Oyeyemi Elijah, Amory‐Mazaudier Christine
Журнал: Space Weather
Том: 23
Номер: 4
Год издания: 2025
Издательство: American Geophysical Union
Местоположение издательства: United States
Номер статьи: e2024SW004324
DOI: 10.1029/2024sw004324
Аннотация: We analysed the solar origin of the severe geomagnetic storms (GSs) of 23-24 March (GS1) and 23-24 April 2023 (GS2) and we examined the ground magnetic response using Geomagnetically Induced Currents (GICs) indices computed from geomagnetic field data. The GSs were initiated by erupting filaments and associated slow (fast) halo coronal mass ejections on 20 March (21 April) 2023. GS1 was also influenced by coronal hole high speed stream (CR HSS) while substorm onsets drove the most intense GICX / GICY of 86 / 70 in Abisko, Sweden. GS2 was marked by strong negative Bz in a sheath and magnetic cloud with larger GIC indices of 84 / 69 driven by magnetic pulsations in Abisko. This posed a moderate risk to power networks in Sweden. The threat however, reached a low / moderate risk level in Boulder during the Sudden Impulse (SI) / main phase of GS1. For GS2, a low risk level was attained in Vernadsky and Eyrewell. As expected, at low latitude, GIC indices constituted a very low risk to ground infrastructures during both storms. The results also revealed longitudinal features with larger GIC indices in Boulder (Vernadsky) during the GS1 (GS2), and a North South Asymmetry characterized by a higher risk level in the northern (southern) hemisphere at the American longitude. Additionally, the study showed that the equatorial electrojet can enhance GIC indices at the magnetic equator in the presence of sufficiently strong dH/dt. Finally, we related GIC indices at high latitude with the CR HSS on 23 March, and a magnetic cloud during the recovery phase on 24 April 2023.
Добавил в систему: Дэспирак Ирина Вадимовна

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Risk Assessment of the Ground Magnetic Response to the March and April 2023 Geomagnetic Storms Using Geomagnetically Induced Currents Indicesстатья Исследовательская статья

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