Articles | Volume 41, issue 1
https://doi.org/10.5194/angeo-41-13-2023
https://doi.org/10.5194/angeo-41-13-2023
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

Related authors

Auroral breakup detection in all-sky images by unsupervised learning
Noora Partamies, Bas Dol, Vincent Teissier, Liisa Juusola, Mikko Syrjäsuo, and Hjalmar Mulders
EGUsphere, https://doi.org/10.5194/egusphere-2023-2857,https://doi.org/10.5194/egusphere-2023-2857, 2023
Short summary
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
Ann. Geophys., 41, 483–510, https://doi.org/10.5194/angeo-41-483-2023,https://doi.org/10.5194/angeo-41-483-2023, 2023
Short summary
The time derivative of the geomagnetic field has a short memory
Mirjam Kellinsalmi, Ari Viljanen, Liisa Juusola, and Sebastian Käki
Ann. Geophys., 40, 545–562, https://doi.org/10.5194/angeo-40-545-2022,https://doi.org/10.5194/angeo-40-545-2022, 2022
Short summary
Spatio-temporal development of large-scale auroral electrojet currents relative to substorm onsets
Sebastian Käki, Ari Viljanen, Liisa Juusola, and Kirsti Kauristie
Ann. Geophys., 40, 107–119, https://doi.org/10.5194/angeo-40-107-2022,https://doi.org/10.5194/angeo-40-107-2022, 2022
Short summary
Induced currents due to 3D ground conductivity play a major role in the interpretation of geomagnetic variations
Liisa Juusola, Heikki Vanhamäki, Ari Viljanen, and Maxim Smirnov
Ann. Geophys., 38, 983–998, https://doi.org/10.5194/angeo-38-983-2020,https://doi.org/10.5194/angeo-38-983-2020, 2020
Short summary

Related subject area

Subject: Earth's ionosphere & aeronomy | Keywords: Space weather effects
The time derivative of the geomagnetic field has a short memory
Mirjam Kellinsalmi, Ari Viljanen, Liisa Juusola, and Sebastian Käki
Ann. Geophys., 40, 545–562, https://doi.org/10.5194/angeo-40-545-2022,https://doi.org/10.5194/angeo-40-545-2022, 2022
Short summary
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, https://doi.org/10.5194/angeo-39-397-2021,https://doi.org/10.5194/angeo-39-397-2021, 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, https://doi.org/10.5194/angeo-37-747-2019,https://doi.org/10.5194/angeo-37-747-2019, 2019
Short summary

Cited articles

Amm, O.: Ionospheric elementary current systems in spherical coordinates and their application, J. Geomagn. Geoelectr., 49, 947–955, https://doi.org/10.5636/jgg.49.947, 1997. a
Amm, O. and Viljanen, A.: Ionospheric disturbance magnetic field continuation from the ground to ionosphere using spherical elementary current systems, Earth Planet. Space, 51, 431–440, https://doi.org/10.1186/BF03352247, 1999. 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, https://doi.org/10.1029/2019GL086677, 2020. a
Balan, N., Ebihara, Y., Skoug, R., Shiokawa, K., Batista, I. S., Ram, S. T., Omura, Y., Nakamura, T., and Fok, M.-C.: A scheme for forecasting severe space weather, J. Geophys. Res.-Space, 122, 2824–2835, https://doi.org/10.1002/2016JA023853, 2017. a
Blake, S. P., Pulkkinen, A., Schuck, P. W., Glocer, A., Oliveira, D. M., Welling, D. T., Weigel, R. S., and Quaresima, G.: Recreating the horizontal magnetic field at Colaba during the Carrington event with geospace simulations, Space Weather, 19, e2020SW002585, https://doi.org/10.1029/2020SW002585, 2021. a
Download
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.