[SFDXA] A possible explanation for the Earth's North magnetic pole moving toward Russia

[Kai]

Thanks Bill, very interesting.
In a related detail, for those (like airplane pilots) who need to know the 
magnetic declination for today or for any date between 1900-01-01 to 2025-01-31, 
see:
   https://geomag.nrcan.gc.ca/calc/mdcal-en.php

Cheers,
Kai

On 5/18/2020 08:32, Bill wrote:
>
>  A possible explanation for the Earth's North magnetic pole moving
>  toward Russia
>
> by Bob Yirka , Phys.org
>
> Historical movement and predicted future path of the north magnetic pole in 
> stereographic projection. Credit: /Nature Geoscience/ (2020). DOI: 
> 10.1038/s41561-020-0570-9
> A possible explanation for the Earth’s North magnetic pole moving toward Russia
>
> A trio of researchers, two with the University of Leeds, the other the 
> Technical University of Denmark, has developed a theory to explain why Earth's 
> north magnetic pole has been drifting from Canada to Russia. In their paper 
> published in the journal /Nature Geoscience/, Philip Livermore, Christopher 
> Finlay and Matthew Bayliff describe their theory and what their models based 
> on it showed.
>
> The Earth's north magnetic pole was first discovered by an explorer named 
> James Clark Ross back in the 1830s. At that time, it was centered over the 
> Nunavut territory in Canada. Since that time, scientists have kept track of 
> its movement <https://phys.org/tags/movement/>, which, until recently, was 
> very slow. But then in the 1990s, it began to pick up speed, moving from 
> Canada toward Siberia in Russia. The movement of the pole has garnered 
> interest in the media because it forces changes to navigational systems and 
> smartphones that use its location as a focal point. In this new effort, the 
> researchers have come up with what they believe is an explanation for the 
> movement of the pole and why it began moving faster.
>
> The researchers suggest that there are two large lobes of negative magnetic 
> flux at the boundary of the core and the mantle. They further suggest that 
> changes in molten metal flow in the core result in changes in the magnetic 
> flux in the lobes. The position of the pole is determined by the strength of 
> the two lobes—when one gains strength, the other loses strength resulting in 
> the pole moving in the stronger direction. The result is a constant tug-of-war 
> between the two lobes. The current movement is therefore due to one of the 
> lobes gaining the upper hand.
>
> The researchers developed their theory <https://phys.org/tags/theory/> after 
> studying 20 years of satellite data (from the European Space Agency's Swarm) 
> to measure the evolving shape of the Earth's magnetic field. Once they had 
> developed their theory, they built a model that matched historical movement of 
> the pole and used it to predict its future path. It showed the pole continuing 
> toward Russia at its current swift pace before slowing—with the pole 
> <https://phys.org/tags/pole/> eventually settling over a part of Siberia. The 
> model was not able to provide any estimates for a more distant future.
>
> https://phys.org/news/2020-05-explanation-earth-north-magnetic-pole.html?utm_source=nwletter&utm_medium=email&utm_campaign=weekly-nwletter 
>
>
> Explore further
>
> Updated World Magnetic Model shows magnetic north pole continuing to push 
> toward Siberia 
> <https://phys.org/news/2019-12-world-magnetic-north-pole-siberia.html>
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