Earth’s Outer Core Flow Reversal Explained: Scientists Discover Sudden Magnetic Shift Beneath Pacific Ocean

Context

Researchers discovered that molten iron flow in Earth’s outer core beneath the Pacific Ocean reversed direction around 2010, revealing unexpected changes deep inside Earth.

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New Findings on Earth’s Outer Core

• First Flow Pattern – Westward Drift: The study found that nearly 95% of outer-core movement consisted of a slow westward flow of molten iron. This explains the long-observed westward drift of Earth’s magnetic field.
• Second Flow Pattern – Eastward Surge:
  • Researchers identified another smaller but dramatic flow pattern in which molten iron beneath the equatorial Pacific Ocean shifted from westward movement to rapid eastward flow around 2010.
  • Weakening After 2020: The eastward surge was found to weaken gradually after around 2020.
  • Link with Inner Core Changes: The sudden reversal was associated with seismic and geodetic changes occurring in Earth’s solid inner core.
  • Flow Imbalance: Outer-core flow was found to be nearly 10% asymmetrical between the northern and southern hemispheres.
• Scientific Importance: The findings may explain sudden “magnetic jerks” in Earth’s magnetic field and show that deep-Earth liquid movements can change faster than previously understood.

About Earth’s Outer Core

• Location: Liquid layer between mantle and inner core, about 2,800 km below Earth’s surface.
• Composition: Mainly molten iron and nickel.
• Geodynamo Process: Continuous movement of molten metals generates Earth’s magnetic field.
• Importance: Earth’s magnetic field protects the planet from harmful solar radiation and charged particles.

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