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

• Published in: Journal of Geophysical Research
• Main Authors: Chulliat, A., Olsen, Nils
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2010
• Subjects: Helena Island; St. Helena; St. Helena Island; South Atlantic Ocean
• Online Access: https://orbit.dtu.dk/en/publications/ed3320ba-9c86-47e9-bee9-43f3a33b0203; https://doi.org/10.1029/2009JB006994

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 data from the Magsat, Ors...