# Tag Info

### 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 ...
• 3,128

### Help determining virtual geomagnetic pole

You say you're "not given the declination angle", but you also say "the horizontal direction of magnetism of these lavas is due west". That's your declination angle, right there! Since I assume (from ...
• 5,380

### 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 ...
• 288
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 ...
• 1,830

### What causes the Earth to have magnetic poles?

There is an alternative theory that the Earth's magnetic field is due to ocean currents since the sea contains (charged) dissolved salts. The flipping of the poles would then presumably be due to a ...
• 465

### 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 ...
• 219
Accepted

### Are the magnetic elements of meteorites that have struck Earth aligned with the magnetic field?

The surface of 'iron' meteorites certainly gets hot enough to exceed the curie temperature, hence the characteristic ablation texture that you see on meteorites in museums. However, that's a surface ...
• 14.1k
Accepted

### How did the intensity of Earth's magnetic field change through geological time?

The Earth's initial accretion was about 4.5 billion years ago, and there is good Hf-W isotopic evidence that an iron core started to form within about 10 M years, and may have been largely complete ...
• 14.1k
Accepted

### Could the magnetic field influence tectonic forces

The electromagnetic force and related field is a strong force at very small distances (governs the way the proton and electron are held to an atom) but is relatively weak over large distances. I don'...
• 393

### 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 ...
• 881

### 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 ...
• 2,753

### 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 ...
• 189
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 ...
• 17.1k
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 ...
1 vote

### 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 ...

Only top scored, non community-wiki answers of a minimum length are eligible