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The earth's magnetic field periodically reverses with north pole becoming south pole and vice versa. Geological evidence also shows the earth's magnetic field will also wander around the earth before it fully changes polarity. These science based observations, may provide a way to manipulate the magnetic field. Instead of using the existing field, maybe use a scenario where field is about to wander; anticipated by some future science. Then build a large attractive field device that can be used to target and attach the wandering field for extra energy. This will not be permanent since the field is controlled at the core but it would be a temporary science marvel that can add to the plot. Later the same technology helps finish the reversal cycle so things can get back to normal.
Quote from: scifiwriter on 11/12/2021 14:50:20My story is set in the middle of a desert. If humans built a massive superconductor/collider there (I'm talking 200+ miles in diameter), could that plausibly serve as an attractor large enough to temporarily capture the field?A field isn't an object to be captured. A tight magnetic field such as is created in a collider might have a radius of under a meter. The windings go around the thickness of the pipe, not the length of it.To mess with Earth's field, you'd probably need windings that go all the way around the planet, not confined to a mere 200 miles which will have negligible effect on something as vast as the moving charges that make up the Earth's field in the core.Superconductors will eliminate energy loss to electrical resistance, but if the field created is doing work (altering currents in Earth's core), then a massive amount of energy would be required. The energy of a spinning planet is many orders of magnitude greater than the puny bigs of energy that humans have learned to manipulate.Positive side is that this is science fiction, so with sufficient bull, one can write one's way past any actual obstacle in physics. There are dang few stories that actually attempt to depict consistent physics. I have a hard time thinking of one.
My story is set in the middle of a desert. If humans built a massive superconductor/collider there (I'm talking 200+ miles in diameter), could that plausibly serve as an attractor large enough to temporarily capture the field?
Also, do you have any idea how much energy would be available in such a scenario? Not looking for actual calculations, just an order of magnitude estimate.
The other idea is seeding the high atmosphere with electrically charged nanoparticles
In Puppy's answer above, he/she said something about temporarily redirecting the field lines, which would effectively create a new "north" while it lasted, correct?