... the magnetic field of the Earth is very much misunderstood. Most of it is caused by currents that flow around the Earth. It's not caused by some kind of magnet in our core ... Most of our magnetic field is in the form of electrical currents flowing around the planet in the solar wind, and in the Van Allen Belt, and in other forms ... That's why, when a very highly charged electromagnetic comet comes by it can very much affect us ...
Jim McCanney, The Spectrum, May 2003
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