From: William Treurniet <wtreurniet.nul> Date: Sun, 29 Jan 2012 22:25:30 -0500 Archived: Mon, 30 Jan 2012 05:50:17 -0500 Subject: Re: Those "Noises" And MSM >From: David Rudiak<drudiak.nul> >To: post.nul >Date: Fri, 27 Jan 2012 09:43:35 -0800 >Subject: Re: Those "Noises" And MSM ><snip> >Before everybody wigs out and attributes such sounds to >'paranormal' origins or secret guvmint project, the most likely >reason for such mysterious sounds is a heat inversion layer, >i.e., air temperature gets warmer as one goes up from ground >level. These are more common in winter. >Temperature inversions can cause sounds to be heard at much >greater distances than normal, the sound equivalent of optical >mirages. Thus somebody might ordinarily be too far from an >airport or busy freeway or thunderstorm to hear the sounds, but >if conditions are right, the sounds can be reflected off higher, >warmer air layers back to the ground and be heard many miles >away. >I remember being in Baja a few years back in wintertime, being >camped by the water, and hearing a loud rumble every hour or so. >It sounded a bit like a jet taking off, but we were in the >middle of nowhere. Finally I figured out it WAS jets taking >off. We were about a dozen miles from the nearest airport, but >the conditions were just right for the sound to travel across >the water. I probably could have been another dozen miles from >the airport and still heard the rumble of jet engines revved up >on takeoff. >Because such inversion layers are usually not the norm, people >start hearing sounds they ordinarily would not and are often >mystified or weirded out by them. Most of the recordings being looked at now are of low-frequency sounds, with the largest spectral peak typically in the neighborhood of 200-250 Hz. Perhaps the sound of a jet engine would be approximately in that area, especially with higher frequencies filtered out by that great a distance. But I would say the recordings do not sound like a jet engine. There could be other sources, but they would need to be as loud as a jet engine (~140 dB at 50 m) to carry a significant distance. There was a recording made in June, 2010, that is definitely not of an aircraft engine. The sound lasted about 5 min and occurred twice about a 1/2 hour apart. Like much that we are discussing, the video could have been dubbed, but I don't see anything to suggest that in this case. http://tinyurl.com/7ejtnvh This sound was more complex with the loudest spectral peak at 3200 Hz. A number of other peaks were below 1000 Hz but these lower frequencies were less audible. The source was said to be impossible to localize but seemed to come from the sky. It was 'super loud' and was so annoying that people in the neighborhood applauded when it stopped. I would point out that higher frequency sounds are hard to localize even under optimal conditions. And because its frequency was so high, the source must have had a very large power if it was far away. William Listen to 'Strange Days... Indeed' - The PodCast At: http://www.virtuallystrange.net/ufo/sdi/program/ These contents above are copyright of the author and UFO UpDates - Toronto. They may not be reproduced without the express permission of both parties and are intended for educational use only.
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