What does a 3,000 year old "Geomagnetic Spike" tell us?
Studies of ancient slag heaps show that the magnetic field varied in strength by 100% over a 30 year period. But only in a small area centred on Jordan.
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| Strength of Earth's magnetic field in 2010 (left) and 1000BCE (right) |
This article discusses this and speculates about what was happening in the core and whether it could happen again and the likely consequences.
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