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Rapid geomagnetic changes inferred from Earth observations and numerical simulations

Earth Sciences

Rapid geomagnetic changes inferred from Earth observations and numerical simulations

C. J. Davies and C. G. Constable

Explore the fascinating insights into extreme variations in Earth's magnetic field direction revealed by groundbreaking research conducted by Christopher J. Davies and Catherine G. Constable. Their study bridges the gap between paleomagnetic changes and core processes, showing rapid directional shifts that challenge current understanding.

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Playback language: English
Abstract
Extreme variations in Earth's magnetic field direction offer insights into the geodynamo. Paleomagnetic studies have reported rapid directional changes (up to 1º yr⁻¹), but their relation to core processes remains unclear. This study shows strong agreement between the amplitudes and latitude ranges of extreme directional changes in geodynamo simulations and a recent observational field model (GGF100k) spanning the past 100 kyrs. Maximum rates reach ~10° yr⁻¹, typically during field strength decreases, much faster than current changes. Analysis suggests these changes are linked to reversed flux movement across the core surface. Future searches should focus on low latitudes.
Publisher
Nature Communications
Published On
Jul 06, 2020
Authors
Christopher J. Davies, Catherine G. Constable
Tags
geodynamo
paleomagnetic studies
extreme directional changes
field strength
core processes
flux movement
latitudes

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