The idea is a coil that is buried and encircles one of the poles at a diameter of say 500 miles. The coil could be levitated of floated in fluid or like a maglev train and either spun or moved vertically by changing buoyancy or alternating magnetic attraction/repulsion. Or if tuned the coil...
I have pondered this many times. I came up with two ideas. Might they work?
The first, a coil buried around the northern hemisphere magnetically levitated and spun so that the solar wind travels through it.
The second, a coil around the entire Earth with a massive lobe. The coil should be...