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The geomagnetic field is a fundamental property of our planet – it protects us from the solar wind, helps us navigate, and observations of local and global geomagnetic field variation on timescales from hours to years reveals information on a multitude of Earth and near-Earth phenomena such as ocean circulation pattern, tides, plasma bubbles in the Earth ionosphere and jet-streams in the core of our planet. Magnetic field fluctuations associated with natural phenomena such as earthquakes and hurricanes can also be observed, and close monitoring of the geomagnetic field variations by satellite systems will further enhance our knowledge and understanding of the coupling of our complex Earth and near-Earth system.


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Swarm reveals Earth's changing magnetism

19 June 2014

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The first set of high-resolution results from ESA's three-satellite Swarm constellation reveals the most recent changes in the magnetic field that protects our planet.

Launched in November 2013, Swarm is providing unprecedented insights into the complex workings of Earth's magnetic field, which safeguards us from the bombarding cosmic radiation and charged particles.

Measurements made over the past six months confirm the general trend of the field's weakening, with the most dramatic declines over the Western Hemisphere.

But in other areas, such as the southern Indian Ocean, the magnetic field has strengthened since January.

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