The magnetic field last flipped 795,000 years ago in an event called the Matuyama-Brunhes reversal.
, a team led by Brad Singer, from the University of Wisconsin-Madison, looked at lava flows to trace back the last major reversal and find out how long it took.
Findings showed the magnetic field started to collapse about 795,000 years ago. It became unstable and there were two partial reversals over the course of 18,000 years, before a full reversal that took about 4,000 years to complete. He continued:"The 22,000 years between the onset of instability in the outer core dynamo was not a surprise. However, the complexity of the record between about 795,000 and 773,000 years ago is surprising. The reversal process is longer lived, and more complex, than previously imagined."
Singer said he and the team now plan to look at the timings of other reversals and excursions recorded in volcanic rocks.
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