Sunday, April 25, 2010

The earth's magnetic field

  • Is produced due to the motion in the Earth's molten iron core.
  • Protects the earth by repelling charged particles emitted by the sun called as the solar winds. These particles trapped in the atmosphere and dragged towards the poles are seen as northern and southern lights. A nice illustration of this concept is shown here:
  • It also protects us from the particles ejected through explosions in space.
  • However, the earth's field is now decreasing - was seen from studying Mars which does not have a magnetic field any more. Though it did have one at some point.

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