Coherence and correlation between stations

The global character of the Schumann resonance is most convincingly manifested in the coherence and correlation of signals measured at stations very far apart. If two stations on opposite sides of the planet — for example in California and Australia — register the same resonance patterns simultaneously, this is direct proof that the source is not local influences but worldwide lightning activity in the common Earth-ionosphere cavity.

This simultaneity originates in the very nature of the phenomenon: the resonance is a standing electromagnetic wave filling the entire cavity, so information about the global sources is "available" everywhere at once. The mutual correlation between stations therefore serves both as a check that the measured signal is genuinely resonant (and not local interference), and as a tool for separating the global components from local artifacts Satori 2024.