Journal
SURVEYS IN GEOPHYSICS
Volume 43, Issue 1, Pages 41-69Publisher
SPRINGER
DOI: 10.1007/s10712-021-09662-4
Keywords
Geomagnetism; Magnetic field modelling; Core time scales
Categories
Funding
- CNES
- ESA [4000127193/19/NL/IA, 4000109587]
- European Research Council (ERC) GRACEFUL Synergy [855677]
- European Research Council (ERC) [772561]
- European Research Council (ERC) [772561] Funding Source: European Research Council (ERC)
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This paragraph discusses the evidence of fast variations in the Earth's core field observed in magnetic observatory and satellite records. It explains how these variations are identified at the Earth's surface and characterized by satellite data. The paragraph also mentions the extraction of their properties at the core mantle boundary through localized and global modeling processes, with emphasis on their time scales. Finally, it lists the possible types of waves in the liquid outer core that may cause these observed fast variations.
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.
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