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Conference Paper

Millennial axisymmetric Magneto-Coriolis modes in Earth’s fluid core

Authors

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

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

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

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Citation

Dumberry, M., Gerick, F., Gillet, N. (2023): Millennial axisymmetric Magneto-Coriolis modes in Earth’s fluid core, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1909


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017673
Abstract
Magneto-Coriolis (MC) modes in Earth’s fluid core involve oscillations sustained by the combined effect of the Lorentz and Coriolis forces. The characteristics of MC modes have been investigated in a few recent theoretical studies, with a focus on modes involving non-axisymmetric motions. Here, we investigate axisymmetric MC modes. We show that for reasonable magnetic field strength and electrical conductivity inside the core, the gravest modes have millennial periods and a quality factor above 1. We investigate the structure of these modes and whether they could be tied to observed millennial changes in Earth’s magnetic field and Length-of-day.