Re: Earth's magnetic pole shift: Sunscreen, clothes, caves may have helped Homo sapiens survive 41kya

On 2025-05-05 04:54:48 +0000, Primum Sapienti said:

Mikko wrote:

On 2025-04-19 05:48:02 +0000, Primum Sapienti said:
 

https://phys.org/news/2025-04-earth-magnetic-pole-shift-sunscreen.html
 The team found that the North Pole wandered
over Europe when the magnetic field's poles
started to flip positions, a natural process
that has happened around 180 times over
Earth's geological history. While the
magnetic reversal didn't complete at the
time, the magnetic field weakened to cause
aurora to occur over most of the globe, and
allowed more harmful UV light to come in from
space.

 Presence or absence of aurora borealis does not significantly affect
UV radiation from space. Most UV comes from Sun. Auroras themselves
produce some ultraviolet but much less that Sun. Air under auroras
stops most of UVB and all of UVC, which are more harmful than UVA and
visible light.
 

Around the same time, Homo sapiens appear to
have started making tailored clothing and
using ochre, a mineral that has sun-protective
properties when applied to the skin, with
greater frequency. These behaviors could have
contributed to their spread throughout Europe
and Asia at a time when the Neanderthal
population was declining.

 Another possibility is that Europe received enough immigrants from more
densely populated areas to compensate the greater mortality, be it caused
by auroras or coldness or something else.

 I'm in the middle of Steven LeBlanc's "Constant
Battles", pub 2003. Dated a bit, I suppose, but
does have a lot of useful odds and ends. (The
relating of Eskimo warfare was something else,
they were willing to spend 10 or more days
traveling to kill another group.)
 The migrants may well have had a tech edge in a
time of changing climate etc as well as no
compunctions about knocking off the current
tenants.

One important point to consider is that the first Eoropean Homo
sapiens sapiens did not survive. Whether the last of them died
at the same time or for the same cause is not clear. Diseases
of the immmigrants from Asia is a good guess for both.
--
Mikko