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The Laschamp or Laschamps, also termed the Adams event [1], was a geomagnetic excursion (a short reversal of the Earth's magnetic field). It occurred between 42,200 and 41,500 years ago, during the end of the Last Glacial Period .
The last time the poles reversed was 780,000 years ago so it’s not like we have a record for this. Turns out 780,000 years is over double the time Earth usually takes between flips.
The first systematic evidence for and time-scale estimate of the magnetic reversals were made by Motonori Matuyama in the late 1920s; he observed that rocks with reversed fields were all of early Pleistocene age or older. At the time, the Earth's polarity was poorly understood, and the possibility of reversal aroused little interest. [6] [7]
The magnetic 'weak point' over the ocean has existed for up to 11 million years, according to researchers.
A geomagnetic excursion, like a geomagnetic reversal, is a significant change in the Earth's magnetic field.Unlike reversals, an excursion is not a long-term re-orientation of the large-scale field, but rather represents a dramatic, typically a (geologically) short-lived change in field intensity, with a variation in pole orientation of up to 45° from the previous position.
The Earth's magnetic North Pole is currently moving toward Russia in a way that British scientists have not seen before. ... before slowing in the last five years to about 22 miles per year ...
Could the poles flip for the first time in 700,000 years?
The magnetic north pole is constantly shifting relative to the axis of rotation of Earth. Magnetism is a vector and so magnetic field variation is studied by palaeodirectional measurements of magnetic declination and magnetic inclination and palaeointensity measurements. Earth's magnetic polarity reversals in last 5 million years.