Short Timescale Core Dynamics: Theory and Observations

Chris Finlay, M. Dumberry, A. Chulliat, M. A. Pais

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Fluid motions in the Earth's core produce changes in the geomagnetic field (secular variation) and are also an important ingredient in the planet's rotational dynamics. In this article we review current understanding of core dynamics focusing on short timescales of years to centuries. We describe both theoretical models and what may be inferred from geomagnetic and geodetic observations. The kinematic concepts of frozen flux and magnetic diffusion are discussed along with relevant dynamical regimes of magnetostrophic balance, tangential geostrophy, and quasi-geostrophy. An introduction is given to free modes and waves that are expected to be present in Earth's core including axisymmetric torsional oscillations and non-axisymmetric Magnetic-Coriolis waves. We focus on important recent developments and promising directions for future investigations.
Original languageEnglish
JournalSpace Science Reviews
Volume155
Issue number1-4
Pages (from-to)177-218
ISSN1572-9672
DOIs
Publication statusPublished - 2010
Externally publishedYes

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