A new type of magnetic wave unveiled by Swarm

Combining satellite measurements from Swarm, as well as from the earlier German Champ mission and Danish Ørsted mission, with a computer model of the geodynamo, a new type of magnetic wave, with a 7 year period, and a westward drift at phase speed of 1500km/year, has been mapped at the Earth’s core-mantle boundary.

Such Magneto-Coriolis waves may account for a significant part of most of the still unexplained interannual geomagnetic field changes.

These outcomes of the research carried out within the 4D-Earth Swarm project, have been recently published in the journal Proceedings of the National Academy of Sciences, and presented at ongoing Living Planet Symposium in Bonn.

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