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The magnetic field of the earth almost died in a critical transition



The magnetic field of the earth almost died in a critical transition

You have undoubtedly seen in the diagram that Earth layers are a bit more complex on egg hard. The coarse shell that lives on the crust is a hot (but still firm) layer that forms a thick layer. In the middle of Jules Verne there are core layers and inner layers of iron. The outer core is the only layer of liquid, because the inner core is very good.

Even if you never visited the core, your life is quite profound. The magnetic field of the earth is generated by the convection of the external liquid nucleus and directs the compasses and shields from the effects of the wind of the sun. The history of the magnetic field of the Earth is a big question, because we do not at least say that I am sure I can solidify the inner nucleus.

Magnets … you know well

there is not there are truly geological record of magnetic field. The small crystals of magnetic mineral magma crystals will be aligned with a magnetic field before freezing in a place. This can be useful since the magnetic fields of the Earth often change the poles (compass needles would approach geographic swamp). The orientation of these mineral needles also indicates how they were created near the equator. The information that was captured by these minerals was the last piece that cracked the tectonic plaque, and that each continent could be imagined in the past.

In addition, the magnetic field may have strong forces. A group led by Richard Bono and John Tarduno at Rochester University was interested in analyzing 565 million years of Quebece rock.

We do not have much more time over, and some researchers might suspect that the inner nucleus was strengthened. In this case, the igneous rocks worked by researchers slowly lowering their surface, probably about 75,000 years ago. Magnetic currents must be longer than usual, so that such temporary changes should be exceeded.

Sauce weak

The group learned that the magnetic field was very weak in time. The Jurassic period is endless with an abnormally weak magnetic field, but it was only one fifth of the time. As a result, it seems that the magnetic poles frequently enter. Behavior is very strange.

With regard to these data, this is a coincidence with the limited information we have for the periods that have occurred at this time, although this is very curious. And the analysis becomes interesting when compared to simulations of the Earth's core simulation. Some of these simulations predicted that the solidification of the internal core was relatively new in geological terms, which occurred in that time. In these models, the reorganization of the nucleus causes the magnetic field to go wild for a while, in a situation that is weakening.

According to the researchers, the nuclear core began in a solidarity of about 565 million years ago, almost 4 million years ago when it entered Earth's life. This adds to the questions about the magnetic field that produces the "geodynamo" in Korea for a long time and for a long time. Likewise, the curiosity of things that are happening in this chapter of the Earth's history is similar to that of the evolutionary explosion on complex animals-animals.

In short, go into the paper Nature GeoscienceFor Carnegie Institution, a researcher at the Peter Driscoll Science Institute (who did not take part in the study), he sets out to work on this hypothetical hypothesis: "Additional paleomagnetic observations in two directions and intensities, the next step towards a clearer vision is the state of the nucleus around this time. and conducting experiments will increase the limitation of the thermodynamic of the corona and, in the end, the exact model of the evolutionary model model includes a detailed specification of how to combine all of these components. "

And if this time of formation of the inner core is correct, as Driscoll writes, "the nucleus of the inner nucleus might be the right to recharge the geodimus and store the Earth's magnetic shield.

Nature Geoscience, 2019. DOI: 10.1038 / s41561-018-0288-0, 10.1038 / s41561-019-0301-2 (about DOI).


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