News of the approaching charismatic pole reversal might have been greatly exaggerated . At least this is the notion of an international squad of researchers , who compared the current country of our planet ’s magnetic battleground to interchangeable occurrences in the late geologic past , where the field weakened and then recovered .
The mind that the rod might be getting ready to reverse has several substantialpieces of evidence . In the last 200 class Earth ’s magnetised field has become weaker , and a weak zone – the South Atlantic Anomaly , which stretches from Chile to Zimbabwe – has become large . The team looked at two important geomagnetic events , one dating back to about 41,000 years ago and the other 34,000 yr ago .
Both events are not pole reversals but geomagnetic excursion , where the subject come close to reverse but then goes back to its original structure . take the data from these two event , the researchers found no grounds that what is operate on on Earth right now is an early stage of either geomagnetic flip-flop or excursion . The study is publish in theProceedings of the National Academy of Science .
The team also compared current psychoanalysis with tilt from a slightly earlier time period , focus on at 49,000 and at 46,000 year ago . The magnetic bailiwick from those time is quite like to what it is like today and the team even come up something akin to the South Atlantic Anomaly in both time geological period . Neither point experienced a turnabout .
“ There has been speculation that we are about to experience a magnetised polar turnabout or excursion . However , by studying the two most recent excursion outcome , we show that neither bear resemblance to current changes in the geomagnetic field and therefore it is belike unlikely that such an event is about to befall , ” Centennial State - generator Professor Richard Holme , from the University of Liverpool , say in astatement .
“ Our research advise alternatively that the current hurt sphere will retrieve without such an extreme case , and therefore is unconvincing to countermand . ”
Geomagnetic about-face does n’t take place at regular interval . They occur between 100,000 and 1 million years and the magnetic theatre takes between 1,000 and 10,000 years to flip-flop , although it might be faster . The last fourth dimension a consummate reversal occur was 780,000 years ago and scientists think it might have been unusually dissolute , it could even have chance within ahuman life .
