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Conference Paper

Dayside ionospheric current response to substorms

Authors

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

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

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

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

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

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Citation

Elhawary, R., Laundal, K., Reistad, J., Madelaire, M., Ohma, A. (2023): Dayside ionospheric current response to substorms, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3822


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020723
Abstract
The interaction between the interplanetary magnetic field (IMF) and the Earth’s magnetic field near the dayside magnetopause plays a significant role in driving the dayside ionospheric dynamics, while magnetotail activities control the nightside ionospheric dynamics. As little is known about the influence of the magnetotail activity on the dayside ionospheric dynamics, we investigate it by performing superposed epoch analyses of ground magnetic field data for substorms that occur when the IMF is northward. Such substorms allows for the untangling of magnetotail activity on the dayside current system since dayside reconnection is minimized. Our analyses indicate that as nightside activity elevates, the dayside ionospheric current changes. We also find that lobe reconnection is weaker before substorm onset than what is expected for northward IMF conditions and then increases after onset. We present possible mechanisms that can explain our observations.