According to Nature, Earth’s north magnetic pole is moving so quickly that the World Magnetic Model (WMM) needed to be updated only four years after its latest update. Even though the 2015 update to the model was expected to remain valid until 2020, it’s close to exceeding the acceptable limit for navigational errors. so, updates were made and released in February 2019.
But, the fact that WMM needed to be updated so quickly has us questioning what is it that causes the poles to shift, and what this means for Earth’s magnetic field. Below, we outline what all plays into the changes.