A few years ago I was looking into a phenomenon called Schumann resonance, just for fun. A year ago, I heard the hum for the first time and I had never heard of it before. Later on, I've wondered if there is any link between them. I truly have no certain opinions about this, it's just something that came to mind and I'd like to know what kind of thoughts this might evoke.
http://en.wikipedia.org/wiki/Schumann_resonances http://www.glcoherence.org/monitoring-system/earth-rhythms.html This one is quite interesting; Note, at the bottom, there's a sound file of how the resonance sounds like when it's pitch-shifted onto an audible range, quite high. If you imagine that sound, much much lower, do you think that its nature sounds like the perceived hum? http://www.space.irfu.se/seminars/20131106_toledo_redondo.pdf It's an interesting correlation that the intensity varies by the time of day. Schumann Resonances, global electromagnetic resonances, excited by lightning, is one of the natural electromagnetic fields on Earth. *But resonances can be excited by any electromagnetic disturbance in the atmosphere. *Reports of the hum have been flooding in while the humanity has been extending the electrical grids. Is this a coincidence? I personally experienced the hum to nearly disappear in the noon, but it got loud at night and reached it peak between 1-5am. Some have reported the intensity to change also by the season. Well, I don't know whether the hum is an acoustic sound or not. But I know that temperature affects how sound travels, and sound waves bend; It travels faster in warm than cold temperature, and the difference of temperatures causes the sound wave to bend, a bit like gravitational pull or refraction. In the daytime, when the sun warms up the ground, the warmth causes sound to steer up and away. In the nighttime, the cool air on the ground steers the sound waves downwards, keeping ground-originated sounds traveling on the low level instead of escaping up and away into the night sky. In the ocean, the top layer of water is warmer because of the sun, but the dark depths are cold. On the border of temperatures, whales actually put this sound refraction phenomenon to good use by using the temperature border level as a "sound tube" where their vocalizing travels long distances without escaping to the warm surface waters or the cold depths. If the hum even has anything to do with sound, this effect of sound bending refraction is an interesting point, considering the fact that the majority of people experienced the hum to be loud at night, nonexistent/silent at day. If the phenomenon is comparable to sound, what if the temperature change just keeps it from escaping the surface of the Earth at night so it becomes a nuisance? I'm no expert but what does the change of temperature cause in electromagnetism or electricity? Doesn't thunderstorm form in conditions where cold and warm air meet? Does it cause excitement in the particles, thus, more energy? The way that temperatures cause gravitational pull in sound wave could be described as some kind of "excitement" between two forces, although it's obviously a lot less excitable to react than electricity is. If you think about the time of night when the hum seems to be at its loudest, isn't that a time when there's an equally long time from the previous day, as it is until the next one? When the meeting of different temperatures, might be, at a turning point of some kind? In wave physics, harmonics and overtones shouldn't be ignored either; Even if the lowest carrier wave was inaudible, its overtone(s) might not. It's also possible that the perceived hum is not the lowest carrier tone at all, but an overtone of a an even lower one that we can't detect. But in that case, what would reveal the overtone so suddenly? Location-based disturbance in the environmental electromagnetism? And, what happens when the assumed wave is shut into a contained space, such as a house? Again I can only talk about the acoustics of sound since it's the more familiar topic to me, but at least for sound, hard and thick materials cause it to reflect and bounce back, and the interfering reflected copies amplify one another if they go into sync. Soft or uneven materials would absorb, dampen or refract a sound wave, causing it to stop easier. In my experience, the hum at least seemed to obey very acoustic-like rules when it came to that; The sound would be the most disturbing in a closed space, a house, and if it was a sound, it would truly make sense because the house traps the soundwave in, allowing it to echo on and on. Step inside a small wardrobe and whisper, it sounds loud because the walls are close and reflect it right back to you. Whisper on the top of a large hill, the sound escapes from your lips and never comes back to your ears so it's as silent as it can be. -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/hum-sufferers. For more options, visit https://groups.google.com/d/optout.
