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    New Analysis Suggests Earth’s Magnetic Field Is Destabilizin - Forum

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    Forum moderator: arya, dethalternate  
    Forum » Main » Science, Astronomy, Nature » New Analysis Suggests Earth’s Magnetic Field Is Destabilizin
    New Analysis Suggests Earth’s Magnetic Field Is Destabilizin
    ManuDate: Sunday, 09-August-2015, 12:49 PM | Message # 1
    --dragon lord--
    Group: undead
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    New Analysis Suggests Earth’s Magnetic Field Is Destabilizing

    photo credit: US Department of Energy

    Earth’s magnetic field is generated by an interaction between rotation in the planet’s core and electrical currents. The field then creates the magnetosphere, which acts sort of like a force field, protecting the planet from the brunt of the sun’s solar wind. This field has both a North and South pole, which can be used for navigational purposes, and they are not static.Variations in the electric current have caused the poles to migrate as much as 16 km (10 miles) per year.

    The field itself is not fixed either, and about every 450,000 years or so, the poles actually reverse. This puts the magnetic North where the South was, and vice versa. Last month, a team from the University of California, Santa Cruz was able to determine that the last pole reversal occurred roughly 786,000 years ago over the course of less than 100 years — within a single human lifetime. Typically, these events take place over the course of thousands of years.

    The planet seems to be long overdue for a field reversal: there is evidence that these events happen more frequently than they used to hundreds of millions of years ago. This could be due to the inner core growing larger, which is obstructing the outer core, resulting in a magnetic field that isn’t quite as solid.

    Evidence of magnetic field reversals can be seen in rocks. When molten rock cools, the metal components are oriented toward the field. By looking at layers of rock, geologists are able to observe where the metallic molecules are pointing, and thus, determine the direction of the magnetic field.

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    Forum » Main » Science, Astronomy, Nature » New Analysis Suggests Earth’s Magnetic Field Is Destabilizin
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