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12 votes

How long does a magnetic pole reversal take to complete?

The entire process appears to take 3,000-4,000 years, according to Valet and Fournier's May 2016 review article "Deciphering records of geomagnetic reversals," which was published in AGU's Reviews of ...
jeffronicus's user avatar
  • 3,486
6 votes
Accepted

What happens when the North and South poles flip?

First of all I will try to explain what a geomagnetic pole reversal is. A magnetic pole reversal happens when the magnetic field weakens until it can no longer sustain itself. This can take 1000-3000 ...
trond hansen's user avatar
  • 1,886
4 votes

How long does a magnetic pole reversal take to complete?

As per our numerical calculations it takes about ~1000 years to completely flip the dynamo, that being said the current models are not even close to the actual parameters in the earth's core because ...
Gaurav Dhama's user avatar
4 votes

Is there evidence of multiple poles (higher order than dipole) in earth's magnetic field?

It's common for dynamo models to predict a large reduction in the dipole field during a reversal. Proving it in the paleomagnetic record is another matter entirely. To characterize the geometry of the ...
A. Newell's user avatar
  • 288
2 votes

Does the magnetic field really protect Earth from anything?

It seems your question was more like a thinking exercise rather than a question. I cannot answer your question with robust confidence in the current state of knowledge. The fact is, I have always ...
Bruzote's user avatar
  • 199
2 votes
Accepted

Does the magnetic field really protect Earth from anything?

Dr. Robert Strangeway kindly shared with me the poster he presented at AGU fall meeting 2017, the one I cited in the question based in the abstract only. I've included below some of the key parts of ...
Camilo Rada's user avatar
  • 17.7k
2 votes

Could the magnetic field influence tectonic forces

The forces of a magnetic field on materials that are not ferromagnetic and not electric conductors are negligible compared to pressure, tension, and buoyancy. It is likely safe to ignore them for the ...
Andris Birkmanis's user avatar
2 votes

Crustal magnetic field of the Earth

This very much depends on what you mean by "accurate"! Two options for a consistent, globally gridded, map of crustal magnetic field scalar anomalies are the World Digital Magnetic Anomaly ...
WJB's user avatar
  • 1,041
2 votes

Can paleomagnetic techniques determine the exact direction of Earth's magnetic poles in the past, not just their polarity?

An important distinction is what kind of magnetic pole we're talking about. The "exact direction of Earth's magnetic poles", would be the dip poles, and no, we can't determine these as we ...
WJB's user avatar
  • 1,041
2 votes

How accurate are paleomagnetic orientation measurements?

When core samples are taken in the field, their orientation must first be measured, generally with standard field tools such as a Brunton. These high quality, professional compasses are good to +/- 1 ...
Knob Scratcher's user avatar
1 vote

Is there evidence of multiple poles (higher order than dipole) in earth's magnetic field?

The simple answer is YES. The Earth's magnetic field is generated by a self-exciting dynamo in the fluid outer core. The interaction between electric currents and liquid motion sustain this field ...
Mark Noel's user avatar

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