The Earth’s magnetic field is weakening and scientists don’t know why
Data collected by the European Space Agency (ESA) and published in May notes that custodia cover huawei mate 20 pro the affected area, known as the South Atlantic Anomaly, has seen the magnetic force weaken cover samsung grand neo personalizzata by nearly 9 per cent over the last 200 years.
There is a lot of speculation about this phenomena custodia samsung j3 silicone is happening, but according to York University astronomy and physics professor Paul Delaney, cover samsung grand neo a portafoglio the anomaly could h&m cover iphone be caused by a regular reversal of Earth’s magnetic field. magnetic field as a function of time really easily. We know that the Poles, our North and South Poles magnetically flip every, on average, 500,000 years,” cover samsung galaxy grand prime 531f Delaney custodia samsung s5neo explained to CTV’s Your Morning on Tuesday.
He added that the last time the Earth’s magnetic field reversed custodia cover huawei p smart was approximately 780,000 years ago. Delaney said the current measurement of the weakening field may suggest that the Earth is about to go through come pulire cover samsung s3 a reversal, but it is unlikely.
“The problem here is that the mechanism generates that magnetic field, and why it reverses is a random type of event. It doesn’t happen periodically, so we can’t really say that this weakening is a precursor to the actual reversal. It might be, but it probably isn’t,” Delaney said.
The ESA estimates that the field loses approximately five per cent of its strength every decade but the agency hasn’t been able to pinpoint how close it may be to its next reversal.
Delaney said the region in question stretches from the northern portion of South America across the Atlantic Ocean into Africa. That area comprises dense rock that forms part of the Earth’s mantle, called the African Large Low Shear Velocity Province.
Scientists have custodia cover samsung j3 also suggested that magnetic field changes may be due to the changes in this dense rock which accounts for the motion of tectonic plates at the surface level.
“The main problem is cover samsung j7 2017 ebay that the magnetic field of the planet is relatively weak there, because the centre of the magnetic field is set away from that region,” Delaney said.
“If you think of the Earth as a big sphere, and you put a nice dot in the middle of custodia cover iphone x xs that sphere, that is where the rotation axis passes, but the magnetic axis passes a few hundred kilometres away from that, away from South America, meaning that the magnetic field that we’re generating inside our planet is weakest there,” he explained.
While the Earth’s magnetic field protects humans from solar radiation, Delaney said the custodia iphone 6 flip most significant effects of the weakening magnetic field are limited to technical malfunctions on board satellites custodia samsung galaxy s4 mini and space crafts.
“The problem is that out radiation belts, full of charged particles, are a lot closer to the surface, and that means it can cause problems for satellites, and people are concerned, all because the cover iphone 6s marcelo burlon magnetic field is the custodia cover samsung s8 plus weakest at that location,” Delaney said.
He custodia per iphone 5s gold added that humans don’t currently have any cause to be concerned.
“Charged particles custodia in silicone per iphone 7 plus – nero of course are not good for you you do not want to be bombarded by high speed electrons, protons and other ions. That’s not good for any life form,” Delaney said.
“The magnetic field of our planet tends to create a huge bubble or a cushion around us, that deflects away most of these charged particles. custodia tablet samsung sm-t550 Some of it does leak in and gets caught in the Van Allen radiation belt but very little gets to the surface of the Earth. That’s a good thing.”
However, Delaney said the weakening custodia iphone 6s impermeabile could start to cause problems for humans if it expands.
“If the magnetic field weakens continuously, in fact if the magnetic field turned off, that would really be bad. As long as we have any measure of magnetic field, even a weakened field, it protects us in large measure from these dangers from space,” he said.
If the magnetic field were to disappear cover samsung j5 silicone patatine completely, Delaney said humans will “really have a problem” because it would increase exposure to higher levels of ultraviolet radiation that can be harmful to humans.
The ESA said it will continue to monitor the weakening magnetic field using its Swarm satellites.
“The mystery of the origin of the South Atlantic Anomaly has yet to be solved,” the space agency said in a statement. “However, one thing is certain: magnetic field observations from Swarm are providing exciting new insights into the scarcely understood processes of Earth’s interior.”..