Feasibly it has something to do with Eva-00's absorption of Armisael. (Which I still don't understand for the life of me...) Rei did it because she loves Gendo like a father. And she saw parts of Gendo in Shinji. And she didn't want any harm to come of him. So she inverted her A...
Well, magnetic fields are just a product of flowing electric current aren't they? The magnetic field would originate from electric current in the earth itself and not from the north or south poles surely. Magnetic fields also originate from permanant magnets, these are usualy ferrous in nature ...
I admit to not understanding how it all works, but the aurora forms as a giant halo around the magnetic poles of the earth - http://www.evageeks.org/ANF-Archive/images/MHH6MDPT585NHHH6R0G12QUSS-c890edf4.jpg In laymans terms: The sun spits out a lot of electrons(e-) and positrons(e+)...