Speaking of the devil, netaphorically, at https://dailygalaxy.com/2025/07/41000-years-ago-earth-lost-magnetic-shield/… up pops the Laschamp excursion without any prompt on my part. Earth’s magnetic shield collapsed 41,000 years ago – an earlier date for Laschamp [or a reference to those humans that survived the event]. It is well known that Laschamp involved a geomagnetic oddity – an excursion of dramatic proportions. The article seems to ignore other factors associated with Laschamp but if you consult the Wiki the information is at hand. We are told that Earth’s magnetic shield collapsed and early humans [post Out fo Africa] faced a solar onslaught. It reshaped how they lived, adapted, and survived. The study, published some time ago in Science Advances has been subject to renewed interest it would seem. The study set out to show Laschamp probably had a major impact on humans – who would have adapted. They were subject to increased exposure to solar and cosmic radiation – and intense auroral phenomena which may have been unbearable in some instances. Earth’s magnetic field is thought to have lost up to 90 per cent of its intensity, or strength, leaving the atmosphere exposed to radiation. This was not a full reversal of the poles, we are told, although earlier literature suggested it was – although the magnetic poles reverted back to the position in which they started. It was a dipole collapse, we are told. Instead of two stable poles the magnetic field fractured into multiple weak mini-poles, scattered across the globe.
This process is described in fine detail by Marinus van der Sluijs in a series of books – see SIS C&C Review 2021:3, and a review of ‘On the Origin of Myths in Catastrophic Experience‘ [Vancouver, 2019]. His work is chock with notes and quotes from scientists, modern and older, as he has studied the subject intently over a number of years and consulted with specialists in the subject. See also in the same issue, ‘Anomalies of the Iron Age: Part One‘ and the so called Miyake events [spikes in C14 in the atmosphere, apparently with a cosmic origin]. The Sterno-Etrussia magnetic excursion in Soviet Georgia, as it then was, was also dated between the 9th and 6th centuries, and appears to be contemporary the Levantine magnetic spike.
The Daily Galaxy link goes on to say humans started living in caves – permanently, or temporarily. In this he is talking about European and Asian caves. The situation elsewhere is open to debate. It was probably universal as cave deposits of early human activity are a global phenomenon. This, they claim, was to avoid the increased radiation. Probably also to avoid the intense auroral phenomena which is also harmful. They also include the use of ochre to cover their skin and tighter fitting clothing for the same reason. Radiation can affect bare skin – which includes the human face. Whether or not the so called adaptations to radiation are real or imagined is not the point, as cave occupancy was a fact even prior to Laschamp. It is the fact that scientists are saying that Laschamp involved a steep increase in solar radiation and auroral activity that counts. It would also explain why there was a mass die-off of animals – and the disappearance of Neanderthals and Denisovans. All this is ignored in the Out of Africa paradigm.