Earths Electromagnetic field may be reversing/with adverse consequences.

Discussion in 'Science and Technology' started by 52ndStreet, Nov 4, 2009.

  1. 52ndStreet
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    52ndStreet VIP Member

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    I saw a science show the other day ,were they state that the Earths electromagnetic field may have begun the process of reversing. This event occurs every 300,000.00 years, were
    the North pole switches places with the south pole, with regards to polarity.

    This reversal of the Earths magnetic field, can expose the Earth to dangerous UV radiation, as the reversal begins.

    Without this Electromagnetic field, the Earths Ozone layer could be stripped from the outer atmosphere, along with
    many other layers of the atmosphere.
     
    Last edited: Nov 4, 2009
  2. Old Rocks
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    While there are possibilities of detrimental effects, the number of times this field has reversed in the geological past, and the fact that there are no coresponding periods of extinction seems to indicate that this is not a major event for the biota on the Earth.
     
  3. goldcatt
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    goldcatt Catch me if you can! Supporting Member

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    There is nothing in the record to indicate any of the times the field has reversed in the past have caused any kind of significant atmospheric changes or effects on land-based life of any kind. Let me guess, somebody's selling gloom and doom on the History Channel again?
     
  4. Cold Fusion38
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    Cold Fusion38 SUPER GENIUS

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    WRONG it switches at RANDOM intervals and if that would kill us then the whole mamal population would have been killed of some time ago. The reversal will be virtually INSTANT and does NOT pose a threat. You know how I KNOW this? Because I studied it in my geology class.

    Look it up for yourself.
     
  5. goldcatt
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    goldcatt Catch me if you can! Supporting Member

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    That would require some work, Cold.

    It's the same thing as the 2012 galactic non-alignment hoopla and the Yellowstone brouhaha and the Moon conspirators and their prattling about the Van Allen belts. It's sensational and people like to watch it on TV, but take a little time to understand the science and it's obviously just made up to sell ads and books.
     
  6. CrusaderFrank
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    Great, my SUV is fucking up the Earth's Magnetic field.

    Google South Atlantic Anomaly
     
    Last edited: Nov 4, 2009
  7. Old Rocks
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    Because of the relitively short span of time, geologically speaking, that such reversals take, it was long regarded that it was very quick. However, the story told by the Steens Mountain basalts have a much more complex plot. Since this article was written, much more work has been done, and the tale is even more complex than first indicated.

    ScienceDirect - Earth and Planetary Science Letters : Core flow instabilities and geomagnetic storms during reversals: The Steens Mountain impulsive field variations revisited


    Abstract
    The origin of the large variations in magnetization direction recorded in two different lava flows at Steens Mountain, Oregon, is discussed. The time constant for lava-flow cooling and the amplitude of the variations imply extremely large variation rates for the ambient field, four orders of magnitude above the present-day secular variation. Two different mechanisms in the liquid outer core (namely turbulence and inertial waves) that may produce such variations are investigated. Energetic considerations indicate that the observed impulsive variations are unlikely to be of internal (core) origin. On the other hand, it is shown that during reversals, when the dipolar field is reduced by a factor ten, magnetic storm perturbations at the Earth's surface are enhanced by a factor two with respect to their present amplitude. It follows that intense magnetic storms can significantly contribute to ambient field changes during reversals. The amplitude of the impulsive variations recorded at Steens Mountain is shown to be consistent with the effect of a strong magnetic storm occurring during cooling of a flow. The direction of the variations is also shown to be consistent with this mechanism if the dipolar field contributes significantly to the internal field during the impulsive change.

    I am following this story with much interest.
     
  8. Old Rocks
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    Don't know what you mean by the Yellowstone brouhaha, but Yellowstone is a clear and present danger. In terms of geological time.

    I am quite sure that it will erupt in a major way in the next 50,000 years. But it bears watching, for sure. We have evidence of geysers that blew off to the altitude of over 5000 ft in the not so distant past. That would definately ruin a lot of peoples vacation were it to happen near a campground. And, occasionly, it pops a little eruption off, about the size of, or a bit smaller, than St. Helens. That, too, could ruin a few vacations.

    Were it to erupt in a major way now, it would be the end of the US as a world power. And create hardship the world over. The worst part of this is we have not had a major caldera volcano erupt in historical times, so we have no idea of what the precursors are.
     
  9. Cold Fusion38
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    Well your SUV probably IS big enough to generate its own magnetic field.
     
  10. Cold Fusion38
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    If that were true we would have rocks that would have crystals that would form facing in ALL directions which I am not aware of being true. As I understand it those crystals point either N or S.
     

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