sparks


Do you think that Earth magnetic field is stationary or rotates exactly with Earth rotation speed ?

@Forest

    I think that the magnetic field or near ambient magnetic field of the Earth is the product of lots of events but in general the crust of the Earth moves at a relative velocity to the magnetic field produced by the core events or hot plasma currents of the core.  These plasma currents are just like dc currents and take on mostly a ring current.  They also can be bidirectional with a shear zone at the equator.  This all happens in the mantle of the Earth.  This generates the torroidal magnetic field we call the magnetosphere.  Most of the surface of the Earth spins within the core of the torroid so that the magnetic field flux is pretty evenly distributed except for those regions that pass over plasma currents not involved with the one that generates the magnetosphere.  So the magnetic flux density within the torroid is pretty much homogenous.
We move relative to it but because of it's nonvarying intensity and the slow relative velocity (1000mph) there isn't alot of voltage induced.
   Not a problem though.  If you have a wire moving through a static magnetic field and one end of the wire is moving faster than the other end then there is induction.  The axle of a homopolar generator is barely moving through a constant magnetic field while the circumference is moving quite quickly through the same field.  A voltage arises between the axle and the circumference.