Observation of magnetic diffusion in the Earth's outer core from Magsat, Ørsted, and CHAMP data

• Published in: Journal of Geophysical Research
• Main Authors: Chulliat, A., Olsen, N.
• Other Authors: Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), National Space Institute Lyngby (DTU Space), Technical University of Denmark Lyngby (DTU), Niels Bohr Institute Copenhagen (NBI), Faculty of Science Copenhagen, University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU), CNES and by the French embassy in Denmark
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2010
• Subjects: frozen-flux; magnetic diffusion; outer core; [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]; Helena Island; St. Helena; St. Helena Island; South Atlantic Ocean
• Online Access: https://hal.archives-ouvertes.fr/hal-00540455; https://hal.archives-ouvertes.fr/hal-00540455/document; https://hal.archives-ouvertes.fr/hal-00540455/file/2009JB006994.pdf; https://doi.org/10.1029/2009JB006994

International audience The frozen flux assumption consists in neglecting magnetic diffusion in the core. It has been widely used to compute core flows from geomagnetic observations. Here we investigate the validity of this assumption over the time interval 1980–2005, using high‐precision magnetic da...