Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 41, issue 1
Articles | Volume 41, issue 1
https://doi.org/10.5194/angeo-41-13-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-41-13-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 41, issue 1
Regular paper
 | 
11 Jan 2023
Regular paper |  | 11 Jan 2023

Drivers of rapid geomagnetic variations at high latitudes

Liisa Juusola, Ari Viljanen, Andrew P. Dimmock, Mirjam Kellinsalmi, Audrey Schillings, and James M. Weygand

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Latest update: 25 Oct 2025
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Short summary
We have examined events during which the measured magnetic field on the ground changes very rapidly, causing a risk to technological conductor networks. According to our results, such events occur when strong electric currents in the ionosphere at 100 km altitude are abruptly modified by sudden compression or expansion of the magnetospheric magnetic field farther in space.
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