Geomagnetic Jerks Finally Reproduced and Explained
Initially described in 1978, geomagnetic jerks are unpredictable events that abruptly accelerate the evolution of the Earth’s magnetic field, and skew predictions of its behaviour on a multi-year scale. Our magnetic field affects numerous human activities, ranging from establishing the direction in smartphones to the flight of low-altitude satellites. It is therefore essential to accurately predict its evolution. Still, geomagnetic jerks have presented a problem for geophysicists for over forty years.
Visualization of the interior of the Earth’s core, as represented by a computer simulation model (view of the equatorial plane and a spherical surface near the inner core, seen from the North Pole). Magnetic field lines (in orange) are stretched by turbulent convection (in blue and red). Hydromagnetic waves are emitted from the inner core, and spread along the magnetic field lines up to the core’s boundary, where they are focused and give rise to geomagnetic jerks.
Credit: © Aubert et al./IPGP/CNRS Photo library
To solve this mystery, Julien Aubert from l’Institut de physique du globe de Paris (CNRS/IPGP/IGN/Université de Paris) developed, with a colleague from the Technical University of Denmark (DTU), a computer simulation very close to the physical conditions of our core. The simulation required the equivalent of 4 million hours of calculation, and was carried out thanks to the supercomputers of GENCI.
Researchers were subsequently able to reproduce the succession of events leading to geomagnetic jerks, which arise in the simulation from hydromagnetic waves emitted in the inner core. These waves are focused and amplified as they approach the core’s surface, causing magnetic disturbances comparable in all ways to the jerks observed.
The digital reproduction and comprehension of these jerks paves the way for better predictions of the Earth’s magnetic field. Identifying the cause of magnetic field variations could also help geophysicists study the physical properties of the Earth’s core and inner mantle.
This research project was financed by the Fondation Simone et Cino Del Duca of Institut de France, which supports fundamental research in the Earth Sciences through one of its scientific grants.
François Maginiot
CNRS
Source: http://www.ineffableisland.com/2019/04/geomagnetic-jerks-finally-reproduced.html
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