Earth Observation Mission News
Swarm helps explain Earth's magnetic jerks
01 May 2019
Our protective magnetic field is always restless, but every now and then something weird happens – it jerks. Although scientists have known about these rapid shifts for some 40 years, the reason why they occur has remained a frustrating mystery, until now.
Since geomagnetic jerks were discovered in 1978 scientists have been trying to work out why the magnetic field suddenly and unexpectedly accelerates.
Image credit: Julien Aubert, IPGP/CNRS/CNRS Photothèque - Simulation of the magnetic field in Earth's core.