In the case of the Earth, Ruhnke explained, the atmosphere completes the circuit. Ultimately, the current returns to Earth through the clear atmosphere. Because it's diffused over most of the globe, it's also quite weak at any given point. The field is about 100 volts per meter, meaning that the electric potential increases by about 200 volts from the ground to the top of Michael Jordan's head when he's standing still. Finally, air is an excellent insulator, so its conductivity is close to zero.
Scientists discuss biology, safety, and statistics of lightning strikes.
Poster papers on hurricanes and tornadoes summarized. Thunderstorms generate elusive and mysterious sprites. Preview of the 11th International Conference on Atmospheric Electricity. Even though you're standing in an electric field, your hair does not stand on end. But it's not evenly felt.