Articles | Volume 40, issue 4
Ann. Geophys., 40, 545–562, 2022
Ann. Geophys., 40, 545–562, 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.

Related authors

Drivers of rapid geomagnetic variations at high latitudes
Liisa Juusola, Ari Viljanen, Andrew P. Dimock, Mirjam Kellinsalmi, Audrey Schillings, and James M. Weygand
EGUsphere,,, 2022
Short summary

Related subject area

Subject: Earth's ionosphere & aeronomy | Keywords: Space weather effects
Atmospheric drag effects on modelled low Earth orbit (LEO) satellites during the July 2000 Bastille Day event in contrast to an interval of geomagnetically quiet conditions
Victor U. J. Nwankwo, William Denig, Sandip K. Chakrabarti, Muyiwa P. Ajakaiye, Johnson Fatokun, Adeniyi W. Akanni, Jean-Pierre Raulin, Emilia Correia, John E. Enoh, and Paul I. Anekwe
Ann. Geophys., 39, 397–412,,, 2021
Short summary
Effects of solar flares on the ionosphere as shown by the dynamics of ionograms recorded in Europe and South Africa
Veronika Barta, Gabriella Sátori, Kitti Alexandra Berényi, Árpád Kis, and Earle Williams
Ann. Geophys., 37, 747–761,,, 2019
Short summary

Cited articles

Amariutei, O. A. and Ganushkina, N. Y.: On the prediction of the auroral westward electrojet index, Ann. Geophys., 30, 841–847,, 2012. a
Apatenkov, S. V., Pilipenko, V. A., Gordeev, E. I., Viljanen, A., Juusola, L., Belakhovsky, V. B., Sakharov, Y. A., and Selivanov, V. N.: Auroral Omega Bands are a Significant Cause of Large Geomagnetically Induced Currents, Geophys. Res. Lett., 47, e2019GL086677,, 2020. a
Belakhovsky, V. B., Pilipenko, V. A., Sakharov, Y. A., and Selivanov, V. N.: Characteristics of the variability of a geomagnetic field for studying the impact of the magnetic storms and substorms on electrical energy systems, Izvestiya, Phys. Sol. Earth, 54, 52–65,, 2018. a
Bertsekas, D. P. and Tsitsiklis, J. N.: Introduction to probability, pp. 145–146, Optimization and computation series, Athena scientific, 2nd ed edn., 2008. a
Bolduc, L.: GIC observations and studies in the Hydro-Québec power system, J. Atmos. Sol.-Terr. Phys., 64, 1793–1802, 2002. a
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.