Earth’s mantle is magnetic, researchers find

Posted: June 7, 2019 by oldbrew in Electro-magnetism, Geomagnetism, physics, research
Tags: ,


Still plenty of work for scientists to do to gain a better understanding of our rotating Earth’s electromagnetic processes.

Scientists assumed Earth’s mantle, the layer stretching from the crust to a depth of 255 miles, was magnetically dead. New research suggests they were mistaken, reports Phys.org.

Most scientists thought Earth’s magnetism was powered by materials in the crust and core, but according to a new study published this week in the journal Nature, hematite, a common iron oxide, retains its magnetic qualities at high temperatures.

“This new knowledge about the Earth’s mantle and the strongly magnetic region in the western Pacific could throw new light on any observations of the Earth’s magnetic field,” Ilya Kupenko, mineral physicist and researcher from the University of Munster in Germany, said in a news release.

Earlier this year, scientists had to complete an early update of the World Magnetic Model, a map of Earth’s magnetic fields that powers a variety of global navigational systems, after Magnetic North began shifting and behaving erratically. The ordeal offered a reminder of how little scientists understand the movement of magnetic materials inside Earth’s interior.

The latest research, however, could help scientists begin to explain some of the planet’s electromagnetic anomalies.

Most of Earth’s magnetism comes from the flow of liquid iron alloys inside the planet’s core. Rocks in the crust also give off magnetic signals. But until now, researchers thought minerals lost their magnetism inside the mantle as a result of the extreme heat and high pressures.

But when, in a series of lab tests, scientists subjected iron oxides to temperatures and pressures comparable to the conditions deep inside the mantle, they found hematite remained magnetic up to a temperature of 925 degrees Celsius.

“As a result, we are able to demonstrate that the Earth’s mantle is not nearly as magnetically ‘dead’ as has so far been assumed,” said Carmen Sanchez-Valle, professor at the Institute of Mineralogy at Munster University. “These findings might justify other conclusions relating to the Earth’s entire magnetic field.”

Full report here.

Comments
  1. Damian says:

    My bet is that the Earth is a hollow, expanding shell. The magnetosphere is a resistance pattern, formed by the massive potential energy difference between the Sun and the Earth, focused in a looped, polar current.
    The Earth’s atmosphere is a plasma sheaf, part of the magnetosphere and the thermobaric layers in both the oceans and the atmosphere are electromagnetic expressions of this.
    The idea that once, in the dim and distant past, everything was set to spinning and this has somehow persisted, is facile. All cosmological rotation is due to these polar electric currents.

  2. JB says:

    Of all the orbs in the solar system, earth has more mass/vol, at 5494 kgm-3 than any other, including the sun. If it is hollow, the atomic weight of the elements composing it must necessarily increase. So what do we know about the elemental composition of the earth?

  3. Damian says:

    If you believe that mass is a measure of the curvature of space/time.
    The Earth may be the least hollow planet. I would bet that Saturn is the most hollow.

  4. ivan says:

    They are proving the science for this isn’t settled, so how can so called ‘climate scientists’ say their science is settled when it obviously isn’t.

  5. BoyfromTottenham says:

    This ‘finding’ should be no surprise to most physicists – the Curie temperature (above which otherwise magnetic materials lose their magnetic properties) has been known since Pierre Curie discovered it in 1895. It is also well known that Iron has a curie point of 770 C, and Cobalt at 1120 C. So why did the article say “Scientists assumed Earth’s mantle, the layer stretching from the crust to a depth of 255 miles, was magnetically dead.”?

  6. oldbrew says:

    From phys.org:
    The surprising result was that the hematite remained magnetic up to a temperature of around 925 °C (1,200 K) – the temperature prevailing in the subducted slabs beneath the western part of Pacific Ocean at the Earth’s transition zone depth. “As a result, we are able to demonstrate that the Earth’s mantle is not nearly as magnetically ‘dead’ as has so far been assumed”

    https://phys.org/news/2019-06-magnetism-earth-mantle.html
    – – –
    MAY 20, 2019
    How Earth’s mantle is like a Jackson Pollock painting
    https://phys.org/news/2019-05-earth-mantle-jackson-pollock.html

  7. hunterson7 says:

    Damian,
    Please share what your evidence is for your best bet.
    Let’s find a way to make your bet real.
    I’ll take the other side.

  8. hunterson7 says:

    read to the end of Damian’s post,
    Please do tell, with actual numbers and examples, not narrative word salad, how the polar current rotates Earth and all planets.
    Thanks

  9. oldbrew says:

    The Source of Magnetic Fields

    All magnetic fields are created by moving charged particles. Even the magnet on your fridge is magnetic because it contains electrons that are constantly moving around inside.

    https://study.com/academy/lesson/how-magnetic-fields-are-created.html
    – – –
    The charge for the charged particles has to come from somewhere. We know the Earth is magnetized with north and south poles. The solar wind seems the obvious candidate, with auroras offering evidence.

    See: https://exploratorium.edu/learning_studio/auroras/happen.html

  10. Wayne Job says:

    In the same way that a magnetic field can magnetise items around it the suns magnetic field gives us our magnet. This is the reason our magnetic shield protecting us from nasty particles is weakening as the solar magnetic field is weakening at the moment. It is very bad at the moment and airline crew are at risk, some are asking to fly at lower altitudes to lower the risk.

  11. Wayne Job says:

    Whilst I am here i would like to recount a strange happening last friday. I live in a country town on a couple of acres next door to a mechanic same age as me 74, he had retired after having a major business fixing cars could not stand it some built a large shed and started another business from home.
    He attracts all the old cars to fix as young mechanics can not fix your car if it does not have a computer. I give you this background to show that he has a lot of experience.

    He noticed that the air conditioner belt was buggered so he removed it, immediately the pulley spun up to fairly fast he grabbed it and could not stop it with his hands so jammed a screw driver against it, he removed the screw driver and it spun up again he removed the power to it but it kept spinning.

    This pulley is a small brake drum running on a bearing that spins with the motor, when power is applied a solenoid applies a brake that locks it to the shaft to drive the air conditioning pump.
    Their are no permanent magnets and no wires connected to it???

    The vehicle was a 1982 Ford F150, the same type of pump fitted to OZ cars in the thousands in that period, non of his old mechanic friends have ever heard of anything like it.Your intrepid posters may have answer. Help.

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