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SCIENCE WATCH .

Earth’s inner core is slowing down, and scientists say this could affect our planet’s magnetic field.

research suggests that Earth's inner core—a scorching hot, dense sphere of iron and nickel—has recently slowed its rotation relative to the planet's surface.

While it may appear from our vantage point that the core is reversing direction, scientists clarify that it is actually oscillating in a cycle that repeats every seven decades or so.

By analyzing seismic waves from earthquakes dating back to the 1960s, researchers from Peking University discovered that the core’s movement has fluctuated over time, with a noticeable shift occurring around 2009. These findings challenge previous theories that the inner core consistently spins faster than Earth's surface, instead pointing to a more complex pattern of motion.

Although the core’s subtle movements may seem irrelevant to daily life, they actually influence Earth's magnetic field—a force that protects us from solar radiation and guides navigation systems.

The North Magnetic Pole has been shifting dramatically in recent decades, moving at an accelerated rate from Canada toward Siberia. Scientists suspect that changes in the core’s motion could play a role in this phenomenon. While the full impact of the core’s slowdown remains uncertain, this research highlights the intricate and ever-evolving relationship between Earth’s deep interior and the world above.

learn more https://www.nature.com/articles/s41561-022-01112-z.epdf

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