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Magnetic Field of the Earth

Magnetic Field of the Earth. What makes it so? Aaron Lariscy. Discovery of the Poles. In the 1600’s William Gilbert published his great study on magnetism "De Magnete “ It gave the first rational explanation of why a compass worked…. the earth itself was a magnet.

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Magnetic Field of the Earth

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  1. Magnetic Field of the Earth What makes it so? Aaron Lariscy

  2. Discovery of the Poles • In the 1600’s William Gilbert published his great study on magnetism "De Magnete“ • It gave the first rational explanation of why a compass worked…. the earth itself was a magnet.

  3. Other uses of the Earths Magnetic Field • The earths magnetic field serves other purposes. • One of the more important is a shield from the radiation of the sun.

  4. Switching poles? • Scientist believe the poles switch every 200,000 years. • Scientist guess the last time this occurred was around 780,000 years ago. • Scientists believe this may happen again soon due to the fact the poles move 20km a year and magnetic field has fallen by 1%.

  5. So.. What causes the magnetism? • The common theory of how it happens is the Geodynamo or Dymano theory.

  6. Basic Principals.. • The basic principals rely on the molten steel in the earths core. • As the outer edges of the molten core of the earth cool the displace the molten inner core. • This molten core is therefore pushed to the surface and due to earth’s rotation flows in a helical motion.

  7. This motion causes friction between the more solid outer core and the helical flowing molten steel creating a current. • This current is responsible for creating the earths magnetic properties.

  8. This is only one theory • Another simpler theory is that the core of the earth is a solid spherical shaped magnet. • No one idea explains everything so basically no one knows 100% why the earth has a magnetic field.

  9. In conclusion • The simple question “how does the earth get its magnetic field” does not have a simple answer. • Its is fairly clear that is somehow relates to the rotation of the earth but exactly how is not clear.

  10. Sources C. Johnson “Source of the Earths Magnetic Field” 02/12/2008 . 04/23/2008 http://mb-soft.com/public/tecto2.html. R. Nave “Magnetic Field of the Earth” 04/23/2008. http://hyperphysics.phy-astr.gsu.edu/Hbase/magnetic/MagEarth.html Dr. David P. Stern “The Great Magnet, the Earth” 11/20/2003 . 04/23/2008 http://www-istp.gsfc.nasa.gov/earthmag/

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