Magnetic north and the elongating blob

For some years now, scientists have been puzzling over why the north magnetic pole has been making a dash towards Siberia. Thanks, in part, to ESA's Swarm satellite mission, scientists are now more confident in the theory that tussling magnetic blobs deep below Earth's surface are at the root of this phenomenon.

Unlike our geographic north pole, which is in a fixed location, magnetic north wanders. This has been known since it was first measured in 1831, and subsequently mapped drifting slowly from the Canadian Arctic towards Siberia.

However, since the 1990s, this drift has turned into more of a sprint - going from its historic wandering of 0-15 km a year to its present speed of 50-60 km a year. This shift in pace has meant that the World Magnetic Model has had to be updated more frequently, which is vital for navigation on smart phones, for example.

Our magnetic field exists because of an ocean of superheated, swirling liquid iron that makes up the outer core. Like a spinning conductor in a bicycle dynamo, this moving iron creates electrical currents, which in turn generate our continuously changing magnetic field.

Numerical models based on measurements from space, including from ESA's Swarm mission, have allowed scientists to construct global maps of the magnetic field. Tracking changes in the magnetic field can tell researchers how the iron in the core moves.

During ESA's Living Planet Symposium last year, scientists from the University of Leeds in the UK reported that these satellite data showed that the position of the north magnetic pole is determined largely by a balance, or tug-of-war, between two large lobes of negative flux at the boundary between Earth's core and mantle under Canada.

Following on from this, the research team has recently published their latest findings in Nature Geoscience.

Phil Livermore, from the University of Leeds, said, "By analysing magnetic field maps and how they change over time, we can now pinpoint that a change in the circulation pattern of flow underneath Canada has caused a patch of magnetic field at the edge of the core, deep within the Earth, to be stretched out. This has weakened the Canadian patch and resulted in the pole shifting towards Siberia."

The big question is whether the pole will ever return to Canada or continue heading south.

"Models of the magnetic field inside the core suggest that, at least for the next few decades, the pole will continue to drift towards Siberia," explained Dr Livermore.

"However, given that the pole's position is governed by this delicate balance between the Canadian and Siberian patch, it would take only a small adjustment of the field within the core to send the pole back to Canada."

Related Links
Swarm at ESA
Earth Observation News - Suppiliers, Technology and Application

Tweet

Thanks for being there;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Monthly Supporter
$5+ Billed Monthly

paypal only

SpaceDaily Contributor
$5 Billed Once

credit card or paypal

A Radar for Plastic: High-Resolution Map of 1 km Grids to Track Plastic Emissions in Seas
Tokyo, Japan (SPX) May 08, 2020
Plastic waste often ends up in river bodies and oceans, posing a serious threat to the marine ecosystem. To prevent the accumulation of plastic debris, we must find out where plastic emission is prevalent. To this end, scientists in Japan have come up with a new method to track plastic emissions from inland areas to sea. This method is useful to identify the "hotspots" of plastic emission and can even help to implement appropriate measures to avoid plastic pollution. Plastic may be an indispensabl ... read more