Ancient humans may have faced radiation risk 41,000 years ago

Around 41,000 years ago, Earth experienced a significant weakening of its magnetic field known as the Laschamps event. This weakening led to a surge in radiation reaching the planet’s surface, potentially impacting the survival of different human species. While some researchers suggest that Neanderthals may have been pushed towards extinction due to this event, modern humans may have adapted by using tailored clothing and ochre sunscreen for protection.

Earth’s magnetic field acts as a protective shield against harmful radiation from space, with fluctuations in its strength and orientation occurring over time. The Laschamps event, studied by researchers like Agnit Mukhopadhyay from the University of Michigan, resulted in a weakening of the magnetic field to just 10% of its current levels, causing significant changes in the environment.

During the Laschamps event, the magnetic poles shifted towards the equator, allowing auroras to be visible in wider areas, possibly even near the equator. The increased solar and cosmic radiation reaching Earth’s surface could have triggered changes in regional climates and driven adaptive behaviors in human populations.

Researchers like Amy Mosig Way from the Australian Museum and Veronica Waweru from Yale University point to evidence of ancient humans using ochre for various purposes, including possibly as a form of sunscreen. However, the debate continues on whether modern humans’ use of tailored clothing and ochre gave them a survival advantage over Neanderthals during this challenging period.

Ladislav Nejman from JCMM in the Czech Republic highlights the harsh conditions faced by humans in Europe during the Laschamps event, which coincided with extreme cold and volcanic eruptions. Despite these challenges, the resilience of Homo sapiens as a species, coupled with potential adaptations like sun protection measures, may have contributed to their dominance over Neanderthals in Eurasia.