Researchers from the University of New South Wales, Sydney, have published the latest findings on the last major geomagnetic reversal on earth about 42000 years ago.The team said that at that time, the earth's magnetic field collapsed, leading to large-scale sudden climate change on the earth. For centuries around the world, the reversal of the earth's magnetic poles combined with the behavior of the sun triggered what the team called "the end of the world.".
Geomagnetic reversal is always accompanied by a series of dramatic events, which have a significant impact on the earth. During the reversal, the ozone layer is destroyed, electric storms ravage the tropics, solar wind will produce Aurora around the earth, and Arctic air devours North America. As cold air pours into North America, ice and glaciers quickly form, as weather patterns change dramatically.
At that time, all life on earth was facing severe tests and tribulations. The researchers believe that this event may have led to the extinction of Neanderthals and other giant animals, and forced modern humans to seek protection in caves.
The scientists used data collected from New Zealand's ancient tree ring, which has been in peat swamps and other sediments for more than 40000 years. Information preserved in fossil rings shows changes in the earth's atmosphere during this period.