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Researchers from the University of Edinburgh and the British Geological Survey have reported a significant change in the movement of liquid iron in Earth's outer core. Around 2010, the flow below the equatorial Pacific Ocean reversed from a slow westward crawl to a rapid eastward surge. The discovery was made by mapping 27 years of iron movement data from ground stations and four European satellites. The study, published on May 24, 2026, reveals two patterns: a steady westward flow accounting for 95% of the movement, and a secondary pattern showing the 2010 shift, which began weakening around 2020. The reversal is linked to seismic and geodetic shifts in Earth's solid inner core, with the flow being approximately 10% lopsided between the northern and southern hemispheres. These findings could explain sudden 'jerks' in magnetic field readings and challenge traditional theories about deep-earth dynamics.
Earth's internal structure has been studied for centuries. The outer core, a liquid layer composed mainly of molten iron and nickel, lies about 2,800 km beneath the surface. Its motion generates the geodynamo that produces Earth's magnetic field, which shields the planet from solar radiation. The concept of a liquid core was confirmed by seismic wave studies in the early 20th century, leading to the current layered model: crust, mantle, outer core, and inner core. The Earth's magnetic field has been observed to drift westward over historical timescales, a phenomenon attributed to the westward flow of outer core material. Traditional dynamo theory assumed that core flows are relatively stable over decades. However, the new study shows that the flow can change direction much faster—within a few years—contradicting earlier assumptions. The research uses 27 years of data (1999–2026) from ground observatories and four European Swarm satellites (launched 2013) to map iron movement, marking a leap in resolution. The findings link the 2010 shift in outer core flow to changes in the inner core's rotation and deformation, suggesting a coupled system that influences magnetic field variations.
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Short-term measures: (1) Continue monitoring with existing satellite constellations (Swarm) and expand ground station networks in under-sampled regions like the Indian Ocean and Pacific. (2) Develop real-time data assimilation models to detect future flow reversals quickly.
Medium-term reforms: (1) Launch dedicated missions to measure inner core rotation and deformation with higher precision, such as the proposed InSight-type seismometers on the Moon or deep-sea observatories. (2) Foster international partnerships for data sharing through bodies like the International Union of Geodesy and Geophysics.
Long-term vision: (1) Integrate core dynamics models with space weather prediction systems to mitigate risks to satellites, power grids, and aviation. (2) Establish a global Geodynamo Observatory Network analogous to the Global Seismographic Network to provide continuous, multi-decadal records. (3) Strengthen public awareness about the role of Earth's magnetic field and its variability.