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"There's something going on," Hallinan said of the aurora's whisper. "It's scientifically unreasonable, yet people do hear it."
Hallinan says the thin air of the ionosphere--where the aurora dances from 60 to about 200 miles above the earth's surface--can't carry sound waves. Even if it could, Hallinan says, we're so far away that it would take several minutes for the sound to reach us.
Hallinan suggests a few possible explanations for auroral noise. He said the brain may sense electromagnetic waves from the aurora and somehow convert them to sound. Another theory is that electrical currents induced on the ground by the aurora (which also corrode the trans-Alaska oil pipeline) may create an audible electrical discharge from nearby objects such as spruce trees or buildings.
It's somehow comforting that this part of the aurora borealis remains a mystery. The voice of the aurora will undoubtedly someday be captured on tape and explained, but if I ever hear it, I'll whisper back. Maybe Barron has something to tell us.
We've been getting this too here in Copenhagen, Denmark
about 7 months since it started
everyday, late night and/or very early morning
sounds like a minor earthquake, or large stones grinding, you can FEEL it, in the floor and HEAR it
IVE BEEN LIVING HERE 19 YEARS
NEVER HEARD OR FELT THIS BEFORE!
The Bristol Hum is the most widely reported hum in the U.K. Some of the features of the Bristol Hum are:
* Sounds like an idling diesel engine.
* Most "hummers" are over the age of 50
* At least one partially deaf person hears the hum without using a hearing aid
* "Hearing" of radar signals can be ruled out, since aluminum foil enclosures do not attenuate the Hum.
* If a signal generator and loudspeaker is used, a zero beat can be heard around 100Hz
* Steel enclosures (such as cars, vehicles, some buildings) slightly attenuate the perceived hum, but only if greater than 1/8" wall thickness.
* J. Hall of Bristol UK committed suicide in 10/96 after having been driven crazy by the hum.
* The Hum can be detected and recorded using coil detectors.
Mysterious humming driving Aucklanders 'bonkers'
Friday October 27, 2006
By Kate Chapman
A mysterious humming driving people to despair across Auckland has pricked the ears, and curiosity, of scientists trying to find the source.
Massey University computer engineering scientists Tom Moir and Fakhrul Alam have been contacted by more than 30 people, most in Auckland and the North Shore, who claim to have heard a humming noise.
The symptoms are similar to those suffered by people with tinnitus, commonly associated with a prolonged high-frequency ringing in the ear.
Most people can hear between 20 hertz and 20 kilohertz and the humming is around 56 hertz, according to Dr Moir's research.
Not everyone could hear the sound, because of its low volume, he said.
"We're all born differently - some people are better runners, some people are better hearers."
An Auckland woman who heard the sound described it as a "low drone or rumble".
The woman, who asked not to be named or have her suburb identified, said the noise had become so bad she was thinking about selling her home.
"I absolutely love my home but last night I couldn't get to sleep before 5am. In desperation I even tried to put Blu-Tack in my ears," she said.
But nothing works. The noise is louder inside and during the night when there are no other sounds to mask it.
Originally posted by Illusionsaregrander
There are places here in the US southwest that have had a "hum" for a very long time.
Originally posted by BlasteR
People have come forward claiming to have actually heard the auroras slightly as a hissing crackling noises (which sounds uncannily similar to amplified ELF recordings of the auroras).