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

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

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017673 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017673_1
Genre: Conference Paper

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Dumberry, Mathieu1, Author
Gerick, Felix1, Author
Gillet, Nicolas1, Author
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1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 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.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-1909
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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