I’m researching outside my field on the radio-physics and geomagnetism, and so I set aside that part of things for now until experts can confirm my proposed mechanism.
But allow me to start showing the biological side of things. A little know paper, “Mechanism for action of electromagnetic ﬁelds on cells”, by Dimitris J. Panagopoulos, Andreas Karabarbounis, and Lukas H. Margaritisa. (2002). http://kyttariki.biol.uoa.gr/mobile_phones/article-2002.pdf cleared an obstacle for me in my search for what is behind the Hum. If you took high school chemistry, you should be able to follow a lot of it.
Some of us who have a working knowledge of the Hum like to quote some old US Naval research that reports on the possible auditory effects of microwaves. Those folks then jump to the assumption that cell phone towers, smart meters and like are responsible for the Hum. I think that this is very unlikely. The subject gets changed when one asks why aluminum foil, which easily blocks microwaves, doesn’t silence the Hum according to multiple reports of those who have tried. (If you’d like to know more about this topic, search online for “radio skin depth”). The paper above provides the answer – now, thanks to the authors, there is a detailed and well-explained mechanism for the activation of human nerve cells by VLF and ELF frequencies, including cells found in the auditory system. VLF and ELF frequencies cannot be blocked by foil; thick metal enclosures with superior welding are required.
Read the paper, ask me questions if you would like, and next I’ll propose an explanation for how the above type of activation interacts with pre-existing low frequency sound and infrasound and the characteristics of VLF energies.