Earth's magnetic field

Earth's magnetic field (and the surface magnetic field) is approximately a magnetic dipole, with one pole near the geographic north pole and the other near the geographic south pole. An imaginary line joining the magnetic poles would be inclined by approximately 11.3° from the planet's axis of rotation. The cause of the field is probably explained by dynamo theory. The magnetic field extends several tens of thousands of kilometres into space as the magnetosphere.

External links

• USGS Geomagnetism Program. Real time monitoring of the Earth's magnetic field. U.S. Department of the Interior, U.S. Geological Survey, February 17, 2005.
• Geomagnetism. National Geophysical Data Center, NOAA. Apr-2005.
• BGS Geomagnetism. Information on monitoring and modelling the geomagnetic field. British Geological Survey, August 2005.
• William J. Broad, "Will Compasses Point South?". New York Times, July 13, 2004.
• John Roach, "Why Does Earth's Magnetic Field Flip?". National Geographic, September 27, 2004.
• "Magnetic Storm". PBS NOVA, 2003. (ed. about pole reversals)

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