Fast Quasi-Geostrophic Magneto-Coriolis Modes in the Earth's core
| Autor: | Felix Gerick, Dominique Jault, Jerome Noir |
|---|---|
| Přispěvatelé: | Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Institute of Geophysics [ETH Zürich], Department of Earth Sciences [Swiss Federal Institute of Technology - ETH Zürich] (D-ERDW), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Grenoble Alpes (UGA)-Université Gustave Eiffel-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Magnetic energy [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Equator Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences Physics - Fluid Dynamics 010502 geochemistry & geophysics Kinetic energy 01 natural sciences Outer core Geophysics (physics.geo-ph) Computational physics Magnetic field Physics::Geophysics Physics - Geophysics Geophysics Earth's magnetic field 13. Climate action Inviscid flow General Earth and Planetary Sciences Geostrophic wind 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters Geophysical Research Letters, 2021, 48, pp.e2020GL090803. ⟨10.1029/2020GL090803⟩ Geophysical Research Letters, American Geophysical Union, 2021, 48, pp.e2020GL090803. ⟨10.1029/2020GL090803⟩ Geophysical Research Letters, 48 (4) |
| ISSN: | 0094-8276 1944-8007 |
| Popis: | Fast changes of Earth's magnetic field could be explained by inviscid and diffusion‐less quasi‐geostrophic (QG) Magneto‐Coriolis modes. We present a hybrid QG model with columnar flows and three‐dimensional magnetic fields and find modes with periods of a few years at parameters relevant to Earth's core. For the simple poloidal magnetic field that we consider here they show a localization of kinetic and magnetic energy in the equatorial region. This concentration of energy near the equator and the high frequency make them a plausible mechanism to explain similar features observed in recent geomagnetic field observations. Our model potentially opens a way to probe the otherwise inaccessible magnetic field structure in the Earth's outer core ISSN:0094-8276 ISSN:1944-8007 |
| Databáze: | OpenAIRE |
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