There is sufficient data about it, electromagnetism is probably the best studied field in physics to date.
Magnetism is in it&#x27;s base not generated due to the modulation of an electric charge but due to a much more basic attribute of charged particles, their magnetic moment which is a result of their spin.
<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Spin_magnetic_moment" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Spin_magnetic_moment</a>
So until you find a zero spin charged particle with a magnetic moment (which will contradict everything we understand about magnetism) I&#x27;ll bet on that we understand it quite well.<p>As far as UFO&#x27;s using the Earths magnetic field we can pretty much rule that out because we know just how weak it is on average it is about 30 Tesla, and 16 Tesla&#x27;s is about the force required to levitate a frog.
<a href="https:&#x2F;&#x2F;www.newscientist.com&#x2F;article&#x2F;mg15420771.600-frog-defies-gravity&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.newscientist.com&#x2F;article&#x2F;mg15420771.600-frog-def...</a><p>So unless flying saucers weight just about as 2 mid sized frogs I&#x27;ll take the bet that if they do exist they use something else to keep them from crashing in the backyards of hillbillies.