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Thread: Pole flips

  1. #1 Pole flips 
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    Is Earth magnetic field reversing?

    A recent report says in every few thousand years, Earth’s magnetic field changes direction. This flipping causing us to expose solar winds and affect global communication and power grids. This may cause mass extinction of species. Lopsided growth of planets core is the cause of this reversal.

    Is that true?


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  3. #2  
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    Quote Originally Posted by Third-eye View Post
    Is Earth magnetic field reversing?

    A recent report says in every few thousand years, Earth’s magnetic field changes direction. This flipping causing us to expose solar winds and affect global communication and power grids. This may cause mass extinction of species. Lopsided growth of planets core is the cause of this reversal.

    Is that true?
    There is what looks to me like a reasonably balanced article on this subject here: https://phys.org/news/2017-01-earth-...ap-affect.html

    It does seem to be the case that the Earth's field has weakened over the last century, by 10% or so, but that this is by no means necessarily evidence of an impending reversal. The intervals between reversals seem random, so one cannot predict a reversal from any previous pattern.

    What I found interesting is that as a reversal occurs, the field does not have to disappear. It seems that one would expect instead a rather chaotic series of multipoles to emerge, after which it may settle into a new dipole alignment.

    It also looks as if there is no real evidence that reversals are associated with mass extinction events, whether directly, due to the field itself, or via some common geophysical process - such as a change in convection in the Earth's interior - that might give rise to both a reversal and increased vulcanism.


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  4. #3  
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    Quote Originally Posted by Third-eye View Post
    A recent report says in every few thousand years, Earth’s magnetic field changes direction.
    The data that I've seen indicates that, on average, it's more like every few hundred thousand years. (Which is why the Earth has had the same North pole for as long as we've had compasses.)
    This flipping causing us to expose solar winds and affect global communication and power grids. This may cause mass extinction of species. Lopsided growth of planets core is the cause of this reversal.
    Sort of. You might see some extinctions due to slightly higher radiation levels, but our atmosphere does a good job of keeping that to a minimum. Power grids? Most power grid problems are caused by the interaction of the Earth's magnetic field and charged-particle storms from the Sun, so the Sun would still be the primary cause of such problems.

    Causes? The Earth's magnetic field is caused by motion of the Earth's molten core. It is mostly iron, so it's conductive, and it can conduct currents that give rise to magnetic fields. It's also in motion (due mainly to convection) and moving current carriers can amplify (or in this case sustain) the currents that give rise to the magnetic field.

    But it's chaotic; currents that flow within the molten iron create magnetic fields, and that field "pushes back" on the iron and resists its motion. Computer models have shown that small instabilities which occur naturally can sometimes get amplified by the same effect that produces the fields to begin with, and cause the system to "flop" to a new equilibrium.

    However, we have only a limited understanding of how big such instabilities have to be, or what conditions are favorable to their generation.
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  5. #4  
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    Quote Originally Posted by Third-eye View Post
    Is Earth magnetic field reversing?

    A recent report says in every few thousand years, Earth’s magnetic field changes direction. This flipping causing us to expose solar winds and affect global communication and power grids. This may cause mass extinction of species. Lopsided growth of planets core is the cause of this reversal.

    Is that true?
    We don't have mass extinctions every few thousand years, or even every few hundred thousand years, so no.


    No need to worry about spontaneous human combustion, nor about glitches in the Matrix, either.
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  6. #5  
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    Quote Originally Posted by tk421 View Post
    Quote Originally Posted by Third-eye View Post
    Is Earth magnetic field reversing?

    A recent report says in every few thousand years, Earth’s magnetic field changes direction. This flipping causing us to expose solar winds and affect global communication and power grids. This may cause mass extinction of species. Lopsided growth of planets core is the cause of this reversal.

    Is that true?


    We don't have mass extinctions every few thousand years, or even every few hundred thousand years, so no.


    No need to worry about spontaneous human combustion, nor about glitches in the Matrix, either.
    Do you reckon? Thymus glands at dawn, again?
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  7. #6  
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    Quote Originally Posted by exchemist View Post
    Do you reckon? Thymus glands at dawn, again?
    Couldn't be sure, but it had a little something of the flavour of exploding internal (and perhaps external) organs...
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    National Geographic news says North magnetic pole moving 40 km per year. Past century, it moved 1100 kms from Arctic Canada towards Siberia. At current speed it reaches Siberia in next 50 years. This may be a normal oscillation. Is that the cause of global climate change?
    Oscillation means, this may return back again? Or, is that the beginning of a flip? But, it is intriguing that south magnetic pole is relatively stable?
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  9. #8  
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    Quote Originally Posted by Third-eye View Post
    National Geographic news says North magnetic pole moving 40 km per year. Past century, it moved 1100 kms from Arctic Canada towards Siberia. At current speed it reaches Siberia in next 50 years. This may be a normal oscillation. Is that the cause of global climate change?
    Oscillation means, this may return back again? Or, is that the beginning of a flip? But, it is intriguing that south magnetic pole is relatively stable?
    I suggest you do three things.

    First, read the replies already made and do not ask questions that have already been answered.

    Second, make up your mind whether you are making a statement or asking a question. Writing a statement and then just sticking a question mark on the end leaves it unclear whether you are asking a question or not and, if so, what the question is.

    Third, you must be about the only person left who does not know the causes of climate change. Read about it. It has nothing to do with the Earth's magnetism.
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  10. #9  
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    Quote Originally Posted by Third-eye View Post
    National Geographic news says North magnetic pole moving 40 km per year. Past century, it moved 1100 kms from Arctic Canada towards Siberia. At current speed it reaches Siberia in next 50 years. This may be a normal oscillation. Is that the cause of global climate change?
    Oscillation means, this may return back again? Or, is that the beginning of a flip? But, it is intriguing that south magnetic pole is relatively stable?
    I suggest you do three things.

    First, read the replies already made and do not ask questions that have already been answered.

    Second, make up your mind whether you are making a statement or asking a question. Writing a statement and then just sticking a question mark on the end leaves it unclear whether you are asking a question or not and, if so, what the question is.

    Third, you must be about the only person left who does not know the causes of climate change. Read about it. It has nothing to do with the Earth's magnetism.
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