It happened around 41,500 years ago or so and it caused the magnetic poles to temporarily reverse until it went back to normal for several hundred years or more. here's what it says quote from this Laschamp article at Wikipedia: partial quote "Since its discovery, the magnetic excursion has been demonstrated in geological archives from many parts of the world.[2] The transition from the normal field to the reversed field lasted approximately 250 years, while the magnetic field remained reversed for approximately 440 years." end partial quote.
I think people are mistaking the Sun's periodic (every 11 years) of it's full pole resversal every 11 years which I believe is why we are getting Aurora borealis effects in Arizona and New Mexico (which is highly unusual). The furthest down I ever heard in the last 30 or 40 years is around 1989 when the Aurora borealis came down as far as Eureka California then. So, all the way down to Arizona and New Mexico is very unusual.
Laschamp event
wikipedia.org
https://en.wikipedia.org › wiki › Laschamp_ev
The Laschamp or Laschamps event was a geomagnetic excursion It occurred between 42,200 and 41,500 years ago, during the end of the Last Glacial Period.
A geomagnetic excursion, like a geomagnetic reversal, is a significant change in the Earth's ... "The Laschamp-Mono lake geomagnetic events and the extinction of ...
A
geomagnetic reversal is a change in a planet's magnetic field such that
the positions of ... in which the field reversed globally (such as the Laschamp excursion) for ...
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