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Magnetic Poles changes in magnetic poles
Posted 17 January 2011 - 01:17 AM
Posted 18 January 2011 - 05:10 PM
when the poles swap though the magnetic field weakens and eventually collapses for them to move but the weakening takes a long time. also even though people say the poles swapping will cause the end of the world it has happened throughout prehistory and nothing happened i mean the poles reversed alot during the dinosaurs and the only end of the world for them was a mountain size asteroid coming down.
Posted 20 January 2011 - 10:26 AM
Posted 20 January 2011 - 09:20 PM
There are electric currents spinning on really wide paths through the magma.
More precisely, there are two dynamos, mutually exciting each other, and in opposite phases. The resulting vector is not exactly zero, it's amplitude and direction depends from the differences between the two dinamos details. That's why it changes, because few differences make it point from one direction to the other one.
And the macro result is important, because the way the ionosphere reacts with the magnetic field is related to the way cosmic rays and other chared particles coming from anywhere will be deviated and point to some parts or earth or some other sites.
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