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Doomsday 2012 And Pole Reversal

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Schematic illustration of Earth’s magnetic field. 
Credit/Copyright: Peter Reid, The University of Edinburgh

Scientists understand that Earth’s magnetic field has flipped its polarity many times over the millennia. In other words, if you were alive about 800,000 years ago, and facing what we call north with a magnetic compass in your hand, the needle would point to ‘south.’ This is because a magnetic compass is calibrated based on Earth’s poles. The N-S markings of a compass would be 180 degrees wrong if the polarity of today’s magnetic field were reversed. Many doomsday theorists have tried to take this natural geological occurrence and suggest it could lead to Earth’s destruction. But would there be any dramatic effects? The answer, from the geologic and fossil records we have from hundreds of past magnetic polarity reversals, seems to be ‘no.’

Reversals are the rule, not the exception. Earth has settled in the last 20 million years into a pattern of a pole reversal about every 200,000 to 300,000 years, although it has been more than twice that long since the last reversal. A reversal happens over hundreds or thousands of years, and it is not exactly a clean back flip. Magnetic fields morph and push and pull at one another, with multiple poles emerging at odd latitudes throughout the process. Scientists estimate reversals have happened at least hundreds of times over the past three billion years. And while reversals have happened more frequently in “recent” years, when dinosaurs walked Earth a reversal was more likely to happen only about every one million years.

 
The movement of Earth’s north magnetic pole across the Canadian arctic, 1831–2001. 
Credit: Geological Survey of Canada

Sediment cores taken from deep ocean floors can tell scientists about magnetic polarity shifts, providing a direct link between magnetic field activity and the fossil record. The Earth’s magnetic field determines the magnetization of lava as it is laid down on the ocean floor on either side of the Mid-Atlantic Rift where the North American and European continental plates are spreading apart. As the lava solidifies, it creates a record of the orientation of past magnetic fields much like a tape recorder records sound. 

 
The last time that Earth’s poles flipped in a major reversal was about 780,000 years ago, in what scientists call the Brunhes-Matuyama reversal. The fossil record shows no drastic changes in plant or animal life. Deep ocean sediment cores from this period also indicate no changes in glacial activity, based on the amount of oxygen isotopes in the cores. This is also proof that a polarity reversal would not affect the rotation axis of Earth, as the planet’s rotation axis tilt has a significant effect on climate and glaciation and any change would be evident in the glacial record.

A schematic diagram of Earth’s interior and the movement of magnetic north from 1900 to 1996. The outer core is the source of the geomagnetic field.
Graphic Credit: Dixon Rohr

Earth’s polarity is not a constant. Unlike a classic bar magnet, or the decorative magnets on your refrigerator, the matter governing Earth’s magnetic field moves around. Geophysicists are pretty sure that the reason Earth has a magnetic field is because its solid iron core is surrounded by a fluid ocean of hot, liquid metal. This process can also be modeled with supercomputers.
 

Supercomputer models of Earth’s magnetic field. On the left is a normal dipolar magnetic field, typical of the long years between polarity reversals. On the right is the sort of complicated magnetic field Earth has during the upheaval of a reversal

Credit: 
 
 Ours is, without hyperbole, a dynamic planet. The flow of liquid iron in Earth’s core creates electric currents, which in turn create the magnetic field. So while parts of Earth’s outer core are too deep for scientists to measure directly, we can infer movement in the core by observing changes in the magnetic field. The magnetic north pole has been creeping northward – by more than 600 miles (1,100 km) – since the early 19th century, when explorers first located it precisely. It is moving faster now, actually, as scientists estimate the pole is migrating northward about 40 miles per year, as opposed to about 10 miles per year in the early 20th century.

Another doomsday hypothesis about a geomagnetic flip plays up fears about incoming solar activity. This suggestion mistakenly assumes that a pole reversal would momentarily leave Earth without the magnetic field that protects us from solar flares and coronal mass ejections from the sun. But, while Earth’s magnetic field can indeed weaken and strengthen over time, there is no indication that it has ever disappeared completely. A weaker field would certainly lead to a small increase in solar radiation on Earth – as well as a beautiful display of aurora at lower latitudes — but nothing deadly. Moreover, even with a weakened magnetic field, Earth’s thick atmosphere also offers protection against the sun’s incoming particles.

The science shows that magnetic pole reversal is – in terms of geologic time scales – a common occurrence that happens gradually over millennia. While the conditions that cause polarity reversals are not entirely predictable – the north pole’s movement could subtly change direction, for instance – there is nothing in the millions of years of geologic record to suggest that any of the 2012 doomsday scenarios connected to a pole reversal should be taken seriously. A reversal might, however, be good business for magnetic compass manufacturers.

Related Link:
› Earth’s Inconstant Magnetic Field

Patrick Lynch
NASA’s Goddard Space Flight Center



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    • immortalsoul24

      —NICE DISINFORMATION.

    • Daniel Samson

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    • zanbaq1

      New predictions

      Shaul Mofaz (Antichrist) will be Israeli Prime Minister( and

      After from earthquake in northern Israel and Syria (december 2012)- and become dry lake Kinneret/ govern -

      period mofaz 427 day and will be killed In Jerusalem:march 2014

      Saudi Arabia king will be dead and after

      start War for get reign :november 2012

      unprecedented Floods In many regions of the world in: september-.. 2012)-

      will be eruption Yellowstone?

      and will be send out ashes During the eight day

      2013
      earthquake in East Mediterranean Sea – with hundreds thousands killed on :december 2012

      will be occupy syria by Jordan army on

      december 2012-February 2013

      and will be war Between Turkey and Jordan in the north-

      eastern syria april 2013

      and after to leave american army in iraq Jordan army will

      be occupy iraq on may-june

      2013

      , some of Sufyani armys (Jordan) will be sink

      into the ground./ This place will be known as Baidah and

      will be located either between Makkah:

      july2013

      (and Madina-volcano (alaise

      Will be killed pious man in Mecca on

      june2013

      2014- return Jesus perhaps on…2013.

      will be coming to earth from the sky for to help Imam Mahdi propagation

      freedom and justice and beneficence in the world

      :idea:
      http://emam-mahdi-1431.blogfa.com

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