My idea is this:
1) the solar wind (flow of ions and then an electric current) is deflected by the Earth's magnetic field, a portion goes to the North Pole and another (of opposite polarity) goes toward the south pole.
2) a small part of this flow reaches the ground and is always propagates in the axis north / south.
3) the ground battery formed by metals buried by a certain time modulates this flow.
4) this modulation is propagated by a certain distance because the ion flow is really moves.
5) the fact that north of the equator maximum sensitivity for lrls is from north to south, while south of the equator maximum sensitivity is from south to north It could be a proof of my theory.
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