Articles | Volume 40, issue 4
Ann. Geophys., 40, 545–562, 2022
https://doi.org/10.5194/angeo-40-545-2022
Ann. Geophys., 40, 545–562, 2022
https://doi.org/10.5194/angeo-40-545-2022
Regular paper
30 Aug 2022
Regular paper | 30 Aug 2022

The time derivative of the geomagnetic field has a short memory

Mirjam Kellinsalmi et al.

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Short summary
Eruptions from the Sun can pose a hazard to Earth's power grids via, e.g., geomagnetically induced currents (GICs). We study magnetic measurements from Fennoscandia to find ways to understand and forecast GIC. We find that the direction of the time derivative of the magnetic field has a short reset time, about 2 min. We conclude that this result gives insight on the current systems high in Earth’s atmosphere, which are the main driver behind the time derivative’s behavior and GIC formation.