Rapid Variations of Earth’s Core Magnetic Field

V. Lesur, N. Gillet, M. D. Hammer, M. Mandea*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Evidence of fast variations in the Earth’s core field are seen both in magnetic observatory and satellite records. We present here how they have been identified at the Earth’s surface from ground-based observatory records and how their spatio-temporal structure is now characterised by satellite data. It is shown how their properties at the core mantle boundary are extracted through localised and global modelling processes, paying particular attention to their time scales. Finally are listed possible types of waves in the liquid outer core, together with their main properties, that may give rise to these observed fast variations.

Original languageEnglish
JournalSurveys in Geophysics
Pages (from-to)41–69
Publication statusPublished - 2022


  • Core time scales
  • Geomagnetism
  • Magnetic field modelling


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