| 摘要 |
An electromagnetic source. At least some illustrative embodiments are electromagnetic sources including a first electrode (136) and a second electrode (138). The electromagnetic source also includes a cable (135) disposed between the first electrode and the second electrode. The second electrode (138) separated from the first electrode (136) by the length L, and the length L of the cable (135) between the electrodes in the range from 1000 meters to 20000 meters (20 kilometers). |
