Articles | Volume 41, issue 2
https://doi.org/10.5194/angeo-41-483-2023
https://doi.org/10.5194/angeo-41-483-2023
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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Cited articles

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Akasofu, S.-I., Chapman, S., and Meng, C.-I.: The polar electrojet, J. Atmos. Terr. Phys., 27, 1275–1305, https://doi.org/10.1016/0021-9169(65)90087-5, 1965a. a
Akasofu, S.-I., Kimball, D. S., and Meng, C.-I.: The dynamics of the aurora – II Westward traveling surges, J. Atmos. Terr. Phys., 27, 173–187, https://doi.org/10.1016/0021-9169(65)90114-5, 1965b. a
Akasofu, S.-I., Meng, C.-I., and Kimball, D. S.: Dynamics of the aurora – IV: Polar magnetic substorms and westward traveling surges, J. Atmos. Terr. Phys., 28, 489–496, https://doi.org/10.1016/0021-9169(66)90058-4, 1966. a
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, b, c
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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.