Waves in the core and mechanical core-mantle interactions

D. Jault, Chris Finlay

    Research output: Chapter in Book/Report/Conference proceedingBook chapterResearchpeer-review


    This Chapter focuses on time-dependent uid motions in the core interior, which can beconstrained by observations of the Earth's magnetic eld, on timescales which are shortcompared to the magnetic diusion time. This dynamics is strongly inuenced by the Earth's rapid rotation, which rigidies the motions in the direction parallel to the Earth'srotation axis. This property accounts for the signicance of the core-mantle topography.In addition, the stiening of the uid in the direction parallel to the rotation axis gives riseto a magnetic diusion layer attached to the core-mantle boundary, which would otherwisebe dispersed by Alfven waves. This Chapter complements the descriptions of large-scaleow in the core (8.04), of turbulence in the core (8.06) and of core-mantle interactions(8.12), which can all be found in this volume. We rely on basic magnetohydrodynamictheory, including the derivation of the induction equation from Ohm's law and Maxwellequations, as presented in Chapter (8.03).
    Original languageEnglish
    Title of host publicationTreatise on Geophysics : Core Dynamics
    Editors Gerald Schubert
    Publication date2015
    ISBN (Print)978-0444538024
    Publication statusPublished - 2015


    • Earth's core
    • Core-mantle topography
    • Torsional waves
    • Rossby waves
    • Quasi-geostrophy


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