Scientists trace back strange behavior in South Atlantic magnetic field 11 million years

A map of the Earth showing the present-day deviation from expected magnetic field direction. Strong deviations are in yellow-orange, and little deviations are in blue. The star is Saint Helena, which is right in the anomaly. The gray line shows the outline of the seismic area that is warmer than the rest of the mantle.

(CNN)In case this was on your 2020 list of worries, the Earth's magnetic field is not about to reverse itself.

Strange behavior in the South Atlantic magnetic field can be traced back as far as 11 million years ago, and it's unlikely to be linked to any impending reversal of the Earth's magnetic field, researchers have found.
Earth's magnetic poles, which serve as the foundation of our navigation, are actively moving. The magnetic field reverses its polarity every several hundred thousand years, where the magnetic North Pole resides at the geographic South Pole. The last reversal took place 770,000 years ago, but if a reversal happened during our lifetime, it could impact navigation, satellites and communications.
    The perplexing behavior in the South Atlantic region causes technical disturbances in satellites and spacecraft orbiting Earth, which has left experts puzzled.
    The area is one of debate between scientists, some of whom question where it comes from, and if it could signal the total weakening of the field, and even an upcoming pole reversal.
    The Earth's magnetic field protects our atmosphere from solar wind, which is a stream of charged particles coming from the sun. The geomagnetic field is not stable in strength and direction, and does have the ability to flip or reverse itself.
    The South Atlantic Anomaly is an area stretching from Africa to South America where the Earth's magnetic field is gradually weakening.
    Here's the good news: In research published Monday, scientists from the University of Liverpool said they have proof that today's South Atlantic Anomaly is a recurring feature, and is unlikely to be linked to any impending reversal of the Earth's magnetic field.
    Researchers analyzed igneous rocks from Saint Helena island, a tiny volcanic island located right in the middle of the South Atlantic and lies in the South Atlantic Anomaly.