Magnetic waves yield clues about Earth's outer core

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https://www.youtube.com/watch?v=iX245TiSB30


 Earth's magnetic field is generated by motion of liquid metal in Earth's outer core. Variations in Earth's magnetic field from 1999 to present-day have been observed by the satellites Swarm, CryoSat-2, CHAMP, SAC-C, and Ørsted. These observations show a train of alternating geomagnetic acceleration and deceleration at high latitude (∼66 degrees N) which move to the west. New research explores two viable types of waves to learn about the structure of the outer core. The researchers found that the waves require a layer thicker than 100 km. If correct, they predict that the high-latitude features will slow down, then change direction and propagate east.

Source: Signatures of High-Latitude Waves in Observations of Geomagnetic Acceleration, Rodrigo Chi-Durán, Margaret S. Avery, Bruce A. Buffett [2021] Geophysical Research Letters https://doi.org/10.1029/2021GL094692

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