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Conference Paper

An investigation of dawn-dusk asymmetries in the plasma sheet

Authors

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

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

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

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

Hatch,  Spencer
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;

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Citation

Decotte, M., Laundal, K., Haaland, S., Pitkänen, T., Hatch, S., Reistad, J. (2023): An investigation of dawn-dusk asymmetries in the plasma sheet, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3581


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020351
Abstract
Since the concept of an open magnetosphere was put forward by Dungey (1961), it has been extensively demonstrated that the dynamics of the magnetosphere-ionosphere system is controlled by the convection of plasma and magnetic flux. In a previous study (Decotte et al., 2023, in review), we have described the auroral oval morphology by deriving the Auroral Occurrence Probability (AOP) from electron energy flux measurements from low-Earth orbiting satellites. The AOP distributions for various geomagnetic conditions revealed a persistent wider dawn sector. In order to explain this asymmetry, we proposed a theory based on a topological mapping between the auroral oval and the magnetospheric plasma sheet, and suggested that the influence of the Earth’s rotation during the sunward transport of the plasma sheet could lead to a pile-up of magnetic flux in the dawn magnetosphere. Here, we investigate this asymmetry in the plasma sheet, which should be detectable in plasma properties statistics from in-situ magnetospheric measurements.