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If the atmospheric condition that causes superrefraction bends the beam equal to or more than the earth's curvature then a condition called ducting, or trapping, occurs. Ducting often leads to false echoes also known as anomalous propagation or simply AP.
Originally posted by kylioneXsushi
Any chance of someone compiling the locations of the rumbling on a map? It might give as a visual aid for recognizing a pattern.
There is another thread here talking about compasses being off as much as 20 degrees showing north to be kind of north east. Just off the top of my head, a lot of the locations people have reported their compasses being off related to the places strange rumbling was heard.
Originally posted by Lionhearte
I can't help but think of LOST when I hear these reports. Is the sky turning purple? Is time moving backwards? Is anyone getting bloody noses?
(This was a joke, but I just realized that the things causing the "flashes" on LOST were caused by electromagnetic pulses, but now I'm just taking a t.v. show too seriously)
Originally posted by space cadet
My idea for an increase in the curvature of the beams on this particular evening, is the moon. I have seen and read about how the moon pulls on earth, actually causing it to stretch out towards it, mishaping the earth temporarily. It makes sense to me that the beam is following a natural curvature path, with the earth, only the earth isn't exactly round right now, hence the excess 'ducting', and widespread reports.
edit to add: Sorry guys, I am assuming that everyone here knows already about the perigree moon, it is still in process right now.edit on 21-3-2011 by space cadet because: meh
Originally posted by Visiting ESB
reply to post by OUNjahhryn
I have no idea the exact dates of these nor does it really matter. I just saw the one I posted so it's the "latest". This thread isn't about that, it's about what these sounds may mean.