Rapid changes in Earths core affecting the planets magnetic fieldJuly 8th, 2008 - 4:19 pm ICT by ANI
Washington, July 8 (ANI): Scientists have shown that motions in the fluid in the Earths core are changing surprisingly fast, and that this, in turn, affects the magnetic field of our planet.
The scientists include the geophysicist Mioara Mandea from the GFZ German Research Centre for Geosciences, Potsdam and her Danish colleague Nils Olsen from the National Space Institute/DTU Copenhagen.
The very precise measurements of the Earths magnetic field delivered by the geosatellite CHAMP, combined with Orsted satellite data and ground observations over the past nine years, have made it possible to reveal what is happening at 3000 km under our feet.
Nils Olsen and Mioara Mandea have for the first time computed a model for the flow at the top of the Earths core that fits with the recent rapid changes in the magnetic field, and is also in agreement with the changes in the Length-of-Day variation.
This core flow is rather localized in space, and involves rapid variations, almost sudden, over only a few months a remarkably short time interval compared with the respectable age of our Planet or even with the time of the last magnetic field reversal, some 780000 years ago.
Scientists from the Helmholtz Centre GFZ and other institutions are currently involved in the ESA Swarm mission, which will follow on the CHAMP achievements.
The Swarm constellation consists of three CHAMP-type satellites, which will measure the Earths magnetic field even more accurately than before. (ANI)
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Tags: champ, constellation, dtu, earths magnetic field, geosciences, german research centre, ground observations, length of day, magnetic field reversal, motions, national space, nine years, olsen, precise measurements, rapid changes, rapid variations, satellite data, space institute, swarm, time interval