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Earth's magnetic field - Wikipedia, the free encyclopedia
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Geomagnetic reversal - Wikipedia, the free encyclopedia
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Without the magnetic field, the planet would be a much more hostile place. Charles Jackman of NASA's Goddard Space Flight Center in Greenbelt, Md., suggests that by exposing the planet to more protons from the sun, a weakened magnetic field ... The mystery of the Earth's magnetic field reversals may at last be solved.;
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By itself, the reversal is strong confirmation of the model, and other details -- magnitude and structure of the field -- also agree well with surface features of Earth's field. The simulation also offers precious insight into the dynamics that sustain the magnetic field and generate reversals.
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3D Numerical Simulation of the Geodynamo and the Earth's Magnetic Field ... The following images and animations show views of a snapshot from a 3D time dependent computer simulation of convection and magnetic field generation in the Earth's liquid core that spans over 80,000 years.
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Visit the companion Web site to the NOVA program Magnetic Storm, which examines evidence that the magnetic field protecting Earth from deadly space radiation has reversed direction many times in the past, and may be headed for another reversal. ... See a Reversal; Watch a simulated flip of the Earth's magnetic field,
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These figures show a simulation of the magnetic field of the Earth, from deep within the Earth's core, reversing itself. Click on image for full size version (55K GIF); Images provided courtesy of Gary A Glatzmaier (Los Alamos National Laboratory) and Paul H Roberts (University of California, Los Angeles).
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As a matter of geological record, the Earth's magnetic field has undergone numerous reversals of polarity. We can see this in the magnetic patterns found in volcanic rocks, especially those recovered from the ocean floors.
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Singer teamed up with paleomagnetist Kenneth Hoffman, who has been researching field reversals for over 30 years, to analyze ancient lava flows from Tahiti and western Germany in order to study past patterns of the Earth's magnetic field.
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Our solution shows how convection in the fluid outer core is continually trying to reverse the field but that the solid inner core inhibits magnetic reversals because the field in the inner core can only change on the much longer time scale of diffusion [2]. Only once in many attempts is a reversal successful,
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