I just spent some time on Wikipedia, learning about Schumann resonance, and had a question: How does the Schumann resonance relate to thunderstorms? Is there a direct relationship between the Schumann resonance and the lightning activity; the number of lightning events per second for example? My assumption is that when the Schumann resonance is higher, there are more lightning events. The Schumann resonance is higher when the cavity between the earth's surface and the ionosphere is smaller. To me, it would seem that the ions in our sky are then also closer together, making it more likely for lightning to occur? I'm curious if this assumption is correct, and how the measurements of both Schumann resonance and lightning events line up.