Earth's magnetic north pole is shifting, forcing an update to the World Magnetic Model (WMM), which is used by navigation systems worldwide.
In about every five years, the U.S. National Oceanic and Atmospheric Administration and the British Geological Survey update the World Magnetic Model .
For those of us who don’t know, WMM is actually a map of Earth’s magnetic field. It “provides precise navigational data for all military and civilian planes, ships, submarines, and GPS units,” NOAA This shift is driven by the flow of molten iron and nickel between our planet’s two large magnetic lobes: the North American lobe beneath Canada and the Siberian lobe under Siberia.In the last two decades, the movement of iron and nickel within Earth’s outer core has made the Siberian lobe region more active, strengthening its influence and causing the
However, “In the past 20 years, it accelerated towards Siberia, increasing in speed every year until about five years ago, when it suddenly decelerated from 50 to 35 km per year, which is the biggest deceleration in speed we’ve ever seen,” Brown added.For instance, “Imagine someone planning to travel by sleigh from a chimney top in South Africa to a snow-covered roof in the UK, a journey of around 8,500 km.
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