The investigation on the creation and potential usefulness of the atmospheric cavity resonance in the VLF range in the current and former radio communication systems

This paper presents an investigation on the signals emitted by some of the former and present Very Low Frequency radio station in the matter of these transmissions' relation to the closest values of the respective Schumann modes, which would indicate the creation of a worldwide VLF standing wave, possibly explaining greater signal readability, recorded in archives for some of the former radio stations. The calculations and comparison showed that a few former and today's radio stations frequencies oscillate around the integer theoretical Schumann mode values, with the NRTF LaMoure signal being the strongest candidate for a global VLF standing wave creation. The second candidate, the Novosibirsk Alfa-system transmitter, is not able to reach this kind of resonance due to its pulse mode of transmission.