Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 41, issue 2
Articles | Volume 41, issue 2
https://doi.org/10.5194/angeo-41-483-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-41-483-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 41, issue 2
Regular paper
 | 
16 Nov 2023
Regular paper |  | 16 Nov 2023

Three principal components describe the spatiotemporal development of mesoscale ionospheric equivalent currents around substorm onsets

Liisa Juusola, Ari Viljanen, Noora Partamies, Heikki Vanhamäki, Mirjam Kellinsalmi, and Simon Walker

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Latest update: 03 Nov 2025
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Short summary
At times when auroras erupt on the sky, the magnetic field surrounding the Earth undergoes rapid changes. On the ground, these changes can induce harmful electric currents in technological conductor networks, such as powerlines. We have used magnetic field observations from northern Europe during 28 such events and found consistent behavior that can help to understand, and thus predict, the processes that drive auroras and geomagnetically induced currents.
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