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Investigation of sub-auroral polarization streams (SAPS) combined with magnetic field data

Authors

Schillings,  Audrey
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Vigger Eldor,  Marie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Milan,  Steven
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Willer,  Anna
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Olsen,  Nils
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Opgenoorth,  Hermann
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hamrin,  Maria
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Schillings, A., Vigger Eldor, M., Milan, S., Willer, A., Olsen, N., Opgenoorth, H., Hamrin, M. (2023): Investigation of sub-auroral polarization streams (SAPS) combined with magnetic field data, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2403


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018354
Abstract
Geomagnetic storms and substorms create strong perturbations in the Earth’s magnetosphere, the ionosphere all the way down to the Earth’s surface. During these disturbed times, the magnetic fluctuations and its short-lived variations in turn provoke geomagnetically induced currents (GICs) at ground level. These induced currents cause perturbations at various levels such as disruptions of navigation and telecommunication systems as well as blackouts in pipelines and power lines. However, localized, short-lived and strong magnetic variations also have been observed during relatively "quiet" solar wind conditions. In this study, we investigate a few cases of rapid magnetic variations during “quiet” solar wind conditions and look after a possible correlation with rapid plasma flow and ionospheric currents typically observed at a sub-auroral latitude, known as sub-auroral polarization streams or SAPS. We combine data from ground-based instruments such as the SuperDARN radars and magnetometer stations (SuperMag, Mag-Swe-Dan) in the sub-auroral regions with satellites data (DMSP and AMPERE). We found several interesting features during SAPS events such as isolated magnetic variations not necessarily at the locations and/or times where we can expect them. We also compare these “quiet” events with similar events during geomagnetic storms and substorms. Both SAPS and rapid magnetic variations were/are the interest of several publications, however, a lot of unknowns remains in both fields. Our study shows the importance of understanding the localized rapid magnetic field variations with higher resolution data under several solar conditions and coupled with ionospheric processes.