The Biefeld-Brown (BB) effect was encountered some 80 years ago but it remains difficult to explain. Experimental work by Einat and Kalderon, on a laboratory ‘lifting’ device noted the following conclusions:
a) Levitating device without any moving/rotating parts is easily obtained in an asymmetric electrodes geometry.
b) The force is always towards the small electrode disregarding the voltage polarity.
c) Wind is obtained towards the big electrode.
d) The size of the electrodes influence the force: smaller small electrode and bigger big electrode both yields higher force.
e) Structures with similar potential distributions but with different electrode area induce different forces, related to the electrode area.
The fact that electrical polarity is irrelevant to the BB effect is important, since an AC current could also be used to demonstrate the effect in a laboratory situation.
In other published anecdotes on the wide web, none of which I will bother with here, the BB effect is always interpreted as an addition to gravity as a force. That is, it is explicitly assumed that gravity exists and that the BB effect counters this force. What seems not considered is that perhaps the BB effect may well be gravity.
Extrapolate the basic BB-model to the Earth with the larger outer plate as the ionosphere that envelopes the smaller Earth plate. Electrical polarity is irrelevant. Force is always towards the smaller electrode which means that in the Earth’s case the BB-Force will always be downwards from the larger electrode, the ionosphere, to the smaller electrode, the Earth.
Think on it.