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Why? Because VLF waves, unlike MHz and GHz waves, can penetrate into the ground and reflect. ELF/VLF waves may in fact be the most reliable means of subterranean mapping, or detecting underground structures. The Stanford ELF/VLF group is actively exploring how these radio waves interact with the Earth’s surface. Lightning has broader impacts than just the flash of light and thunder. For instance, certain kinds of lightning can cause a brief discharge tens of miles above the cloud, called sprites, which were predicted in the 1920s but not discovered by scientists until 1989. In fact, some lightning can even accelerate electrons to speeds enormously close the speed of light, producing gamma rays that we usually only see in association with collapsing stars and black holes. The Stanford ELF/VLF group is actively engaged in understanding how lightning impacts out planet’s ionosphere and magnetosphere. …