Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
2ISTerre - Institut des Sciences de la Terre (ISTerre, OSUG-C (Maison des Géosciences), 1381, rue de la Piscine, 38610 GIERES
ISTerre, Université Savoie Mont Blanc, Campus Scientifique, 73376 Le Bourget-du-Lac Cedex - France)
Abstract : Abstract 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.
https://hal-insu.archives-ouvertes.fr/insu-03525969 Contributor : Vincent LesurConnect in order to contact the contributor Submitted on : Friday, January 14, 2022 - 11:34:17 AM Last modification on : Sunday, January 16, 2022 - 3:30:48 AM Long-term archiving on: : Friday, April 15, 2022 - 6:35:29 PM
V. Lesur, N. Gillet, M. Hammer, M. Mandea. Rapid Variations of Earth’s Core Magnetic Field. Surveys in Geophysics, Springer Verlag (Germany), 2022, ⟨10.1007/s10712-021-09662-4⟩. ⟨insu-03525969⟩