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An empirical 3D model of the ionospheric current system spanning two decades

Authors

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

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

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

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

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

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

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Citation

Alken, P., Egbert, G., Maute, A., Richmond, A., Lu, G., Pham, K. (2023): An empirical 3D model of the ionospheric current system spanning two decades, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3667


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020875
Abstract
The Earth's ionosphere is home to numerous electric current systems driven by the global wind dynamo, gravity, pressure gradients, and coupling to the magnetosphere. Each of these current systems exhibits rich and complex structure on a wide range of both temporal and spatial scales. Improved understanding of the ionospheric current system enables us to predict the effects of space weather events, interpret magnetic field observations on ground and in space, and probe the conductivity structures of the deep Earth interior.The work we describe here is a simple data assimilation method which focuses on modeling the ionospheric currents in the diurnal frequency band. We utilize a one year TIEGCM simulation to construct a set of spatial modes which capture the salient 3D structures of the major ionospheric current systems. These spatial modes are then combined with a set of temporal modes derived from the ground observatory network over a 20 year time frame, in order to build a time-continuous 3D model of the global ionospheric current system in the diurnal variation band. This is, in effect, a 4D model of the ionospheric currents and their associated magnetic fields spanning two decades. We will report on the methodology used to build our model, as well as the main features of the model. We will also discuss possible extensions of our method to other frequency bands, in order to capture, for example, higher frequency variations which could occur during geomagnetic storms.