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Dawnside storm-time wedge current systems and their relation to mesoscale auroral and magnetospheric dynamics

Authors

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

Gallardo-Lacourt,  Bea
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

Ohtani,  Shin-ichi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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Citation

Cribb, V., Gallardo-Lacourt, B., Kepko, L., Ohtani, S.-i., Sorathia, K., Merkin, V. (2023): Dawnside storm-time wedge current systems and their relation to mesoscale auroral and magnetospheric dynamics, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0987


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016458
Abstract
Geomagnetic storms are characterized by changes in the horizontal component of Earth’s magnetic field corresponding to an increase in the strength of the ring current. A common feature of geomagnetic storms is a duskside partial ring current. Recently, Ohtani (2021) performed a statistical study using SuperMAG data to reveal a dawn-dusk asymmetric low latitude ground magnetic field depression that was consistent with a dawnside wedge current system closing partially through the dawnside westward auroral electrojet. Rather than the partial ring current contribution, this dawnside wedge current adds to the greater magnetic depression at Earth’s duskside and dawn-dusk asymmetry during magnetic storms. In this work, we examine magnetometer data from the GOES satellites, auroral imaging data from the THEMIS ASI array, and particle data from LANL and DMSP satellites, to examine this wedge current system and its potential relationship with omega bands, a mesoscale auroral form seen in the post-midnight sector during magnetic storms. We also compare this in-situ data to signatures of the dawnside wedge current seen in existing simulations. Since it is likely that this current system is a result of a magnetotail process, we hope to gain a better understanding of storm-time magnetotail dynamics and cross-system coupling between the magnetotail, inner magnetosphere, and ionosphere.