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magnetic north just changed. here\'s what that means.

by:Newland     2019-08-30
The Magnetic North has never been static.
In the past few hundred years or so, due to the liquid outer core that the earth stirred about 1,800 miles below the surface, the direction of our compass fixing point has been moving north.
In recent years, however, scientists have noticed something unusual: the conventional plod of the magnetic North has moved to the upmarket, allowing it to gallop in the northern hemisphere, and no one can fully explain why.
These changes are so big that scientists are starting to make urgent updates to the world\'s magnetic models, a mathematical system that lays the foundation for navigation from mobile phones and ships to commercial airlines. But then the U. S.
As Nature News first reported earlier this year, the government shut down the official release of the model.
Now the waiting for the new North is over.
On Monday, the World Magnetic Model update was officially released, and the Magnetic North can once again be accurately positioned for people around the world.
The question remains: why is the magnetic North changing so fast?
What is the impact of the update delay?
Is there really a geological reason for Google Maps to get me off track?
We got it for you.
The magnetic north is one of the three arctic poles of our Earth.
First of all, there is the real North, which is the north end of the axis of our planet\'s rotation.
But the protective magnetic bubble of our planet, the magnetic layer, is not exactly the same as this spin.
Instead, the generator at the core of the Earth produces a magnetic field that deviates slightly from the axis of rotation of the Earth.
The northern end of this planet
The size of the bar magnet, known as the \"magnetic north\", is a point on the northwest coast of Greenland, and its position has hardly changed in the past century.
Then the magnetic north, where your compass is, is defined as the point the magnetic field line points vertically down.
Unlike the magnetic north, this position is more susceptible to the surge and flow in the liquid iron vortex in the core.
These currents are drawn on the magnetic field, making the magnetic north jump globally.
Phil Livermore, a physicist at the University of Leeds, said the Arctic is a very sensitive place.
James Clark Ross was first located in magnetic north on a scattered island in the Nunavut region of Canada in 1831.
Since then, in the past few decades, the Arctic has basically been traveling north, crossing hundreds of miles. (
It is strange that during this time it has the opposite polarity, and the magnetic south has barely moved. )
To keep up with all these changesS.
Ciaran Beggan said that the National Oceanic and Atmospheric Administration and the British Geological Survey have developed models that are ultimately called the world\'s magnetic models, so they are basically on the same map, A physicist at BGS
The model is updated every five years and the last update is in 2015.
Between each update, scientists check the accuracy of the model based on the ground Magnetic Observatory and the group mission data of the European Space Agency
Field mapping satellites flying around the Earth 15 to 16 times a day.
So far, it seems to be enough to keep up with the pace of Cibei\'s march into Siberia.
In the 1900 s, the Arctic moved slowly at less than a hundred feet a day, with the annual difference adding up to less than seven miles.
But after the 90 s, the situation began to change.
In the early days, magnetic north advanced at a speed of 34 miles a year.
Livermore says things are acting very strangely at high latitudes, noting that this increase appears to coincide with the enhanced injection in the outer core of the Earth\'s liquid.
While these events can be linked together, it is not yet certain.
By the beginning of 2018, scientists realized that the model would soon surpass the magnetic field.
Based on navigation.
Something must be done before the next regular update of the model scheduled for 2020.
To correct this model, scientists at NOAA and BGS adjusted it using data from the last three years.
This updated version is pre-
Released online on October 2018.
As Beggan explained, these include the main users of the model in the defense and military fieldsS.
US Department of Defense, US Department of DefenseK.
The Defense Ministry and the North Atlantic Treaty Organization.
The government shutdown delayed the full public release of the information, including online calculators, software and technical instructions describing the changes.
In principle, everyone who uses magnetic navigation can benefit from this update, says Boulder aud Chulliat, a geomantic scientist at the University of Colorado in Boulder and a subsidiary of NOAA.
Beggan added that the model has entered many modern map systems, including Google and Apple.
But for most civilian purposes, the difference is small and the change is mainly limited to latitude above 55 degrees.
Regular users will not be overly affected unless they happen to be hiking high in the Arctic, says begbeggan.
Interest in these unexpected shocks is not just a mapping.
The dance of the Earth\'s magnetic field line is one of the few windows that scientists have to deal with thousands of miles under your feet.
At 2018 fall meeting of the American Geophysical Union, Livermore showed what he called a magnetic field. of-
This may provide an explanation for the latest strange behavior.
He explained that the Arctic appears to be controlled by two magnetic fields, one in northern Canada and the other in Siberia.
Historically, the one below Northern Canada seems to be stronger, keeping the clutch of the magnetic poles.
But it seems that things have changed recently.
The Siberian patch looks like it won the battle, he said.
This is a way of pulling the magnetic field all the way to the geographical pole.
This may be due to spray smearing inside the core, which weakens the magnetic field under Canada, he said.
The increase in jet speed seems to coincide with the time the Antarctic has extended north over the past few decades.
But he warned against jumping to conclusions too early.
There is probably a link there, he said.
Not sure, but it may be.
Robyn Fiori pointed out that it is difficult to predict what will happen to the magnetic Arctic and whether it will keep pace as it stumbles towards Siberia, a Canadian Natural Resources Research Scientist.
The only certainty about the magnetic north is its predictability.
Geological maps of the more strange polar movements are preserved on the rocks, indicating that over the past 20 million years, the magnetic north and the magnetic south have flipped places many times.
This seems to happen about every 200,000 to 300,000 years.
The exact reasons behind these reversions are still uncertain.
But the latest sport should not confuse you with the upcoming flip.
There is no sign of a reversal, said the company.
Even with a reversal, geological records show that these things take at least thousands of years. âx80x9d (
What happens when the magnetic field is flipped?
This is what we know. )
The Magnetic North model suggests that this latest leap is not even the weirdest thing the Antarctic has done in recent history, Fiori added.
Before 1900, its roaming could have had more swings, possibly including several hairpin turns in northern Canada that could have allowed the pole position to move briefly south.
All this, she says, has to do with changes in the movement of the outer core fluid.
Therefore, it is difficult to say whether the new speed of the magnetic north is the new normal.
We know that pole positions are now moving faster than in decades, but how often does this happen in a long history?
Asked Jeff Reeves, a space scientist at Los Alamos National Laboratory.
We don\'t know anything.
All we know is that what it is doing now is different, which is always exciting in science.
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