posted on May, 21 2022 @ 09:49 AM
a reply to:
anonentity
Laschamp event
"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. During the
transition, Earth's magnetic field declined to a minimum of 5% of its current strength, and was at about 25% of its current strength when fully
reversed. This reduction in geomagnetic field strength resulted in more cosmic rays reaching the Earth, causing greater production of the cosmogenic
isotopes beryllium-10 and carbon-14, a decrease in atmospheric ozone, and changes in atmospheric circulation.[3][4]
This loss of the geomagnetic shield is claimed to have contributed to the extinction of Australian megafauna, the extinction of the Neanderthals and
the appearance of cave art.[5][6][7] However, the lack of corroborating evidence of a causal link between the Laschamp event and population
bottlenecks of many megafauna species, and the relatively moderate radio-isotopic changes during the event, have cast significant doubt on the real
impact of the Laschamp event on global environmental changes.[8]
Because it occurred approximately 42,000 years ago, the period has been termed the Adams Event or Adams Transitional Geomagnetic Event, a tribute to
science fiction writer Douglas Adams, who wrote in The Hitchhiker's Guide to the Galaxy that "42" was the answer to life, the universe and
everything.[9][10]"
edit on 21/5/22 by Grenade because: (no reason given)