Earth's Outer Core Reversed Flow in 2010, Defying Its Usual Westward Drift
Updated
Updated · Slashdot · May 31
Earth's Outer Core Reversed Flow in 2010, Defying Its Usual Westward Drift
5 articles · Updated · Slashdot · May 31
Satellite magnetic-field data show a section of Earth's molten outer core beneath the Pacific flipped in 2010 and began moving eastward against the normal westward flow.
The reversal appeared as a large wave-like structure in the iron-rich liquid layer, indicating forces inside the core can shift bulk material rather than just local currents.
Scientists still do not know what triggered the change, but the new analysis suggests Earth's deep interior is more dynamic and variable than previously thought.
That matters because the churning conductive metal in the outer core generates Earth's magnetic field, which helps shield the atmosphere and block harmful cosmic radiation.
Earth's core flow reversed, then weakened after 2020. What mysterious force is driving these changes deep within our planet?
A river of molten iron deep inside Earth is flowing backwards. Could this signal the start of a magnetic pole reversal?
Earth's 2010 Outer Core Flow Reversal: Discovery, Causes, and Implications for the Magnetic Field
Overview
In 2010, scientists made a landmark discovery when Earth's liquid outer core beneath the equatorial Pacific Ocean suddenly reversed its flow direction, shifting from a weak westward motion to a strong eastward movement. This unexpected event challenged long-held beliefs about the stability of Earth's deep interior and revealed that the molten iron-nickel alloy in the outer core can change much more abruptly than previously thought. The discovery profoundly impacted the scientific community, raising new questions about core dynamics and prompting ongoing research into the causes and implications of such dramatic changes deep within our planet.