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Originally posted by charlespearl
reply to post by discl0sur3
Spacequakes Rumble Near Earth
I believe the sound everyone heard is called a "Spacequake" [as NASA writes it]. Check this article from NASA. Could be from space but it could probably be caused by HAARP. Anything effecting the Earth's magnetic field would seem to cause this phenomenon.
July 27, 2010: Researchers using NASA's fleet of five THEMIS spacecraft have discovered a form of space weather that packs the punch of an earthquake and plays a key role in sparking bright Northern Lights. They call it "the spacequake."
A spacequake is a temblor in Earth's magnetic field. It is felt most strongly in Earth orbit, but is not exclusive to space. The effects can reach all the way down to the surface of Earth itself. "Magnetic reverberations have been detected at ground stations all around the globe, much like seismic detectors measure a large earthquake," says THEMIS principal investigator Vassilis Angelopoulos of UCLA.
science.nasa.gov - Spacequakes Rumble Near Earth
The research, sponsored chiefly by the European Space Agency, builds upon work in the 1960s that showed that when a fault moves, the displacement sends out an acoustic signal, or radio wave, that moves up through the atmosphere. It's sort of like the sound wave generated by the vibration of a loud speaker in a sound system.
Cosmic rays crashing into the Earth over the South Pole appear to be coming from particular locations, rather than being distributed uniformly across the sky. Similar cosmic ray "hotspots" have been seen in the northern skies too, yet we know of no source close enough to produce this pattern.
It's a mystery because the hotspots must be produced within about 0.03 light years of Earth. Further out, galactic magnetic fields should deflect the particles so much that the hotspots would be smeared out across the sky. But no such sources are known to exist.
Others have proposed that a local phenomenon called magnetic reconnection – in which solar magnetic field lines cross and rearrange, converting magnetic energy to kinetic energy – could be accelerating local cosmic rays to energies in the TeV range and beaming them towards Earth, creating the observed hotspots. "It implies that we have a Tevatron in the solar system," says Aharonian, referring to the particle accelerator at Fermilab in Batavia, Illinois. "That's also crazy, but it is at least less crazy than other explanations."
Originally posted by StealthyKat
reply to post by Quaid
Interesting! I have heard of this too, and it sounds very plausible. It sounds very similar to earthquake sounds or the rumble of a volcano, except it's coming from the sky. Have you heard the "screeching" one? It's a loud screech coming from the sky, and it sounds kind of like grinding gears....
"Now we know," says THEMIS project scientist David Sibeck of the Goddard Space Flight Center. "Plasma jets trigger spacequakes." According to THEMIS, the jets crash into the geomagnetic field some 30,000 km above Earth's equator. The impact sets off a rebounding process, in which the incoming plasma actually bounces up and down on the reverberating magnetic field. Researchers call it "repetitive flow rebuffing." It's akin to a tennis ball bouncing up and down on a carpeted floor. The first bounce is a big one, followed by bounces of decreasing amplitude as energy is dissipated in the carpet.
When a meteor wallops the Earth’s atmosphere, it ionizes the air around it and creates a glowing trail of plasma. As the plasma cools, the electrons and ions create a vibration. They are called VLF vibrations and they are capable of transmitting electromagnetic waves over hundreds and hundreds of kilometers. These “sounds” aren’t necessarily heard by human ears but can vibrate objects like wires, aluminum objects, or something close to you. This is a form of low frequency radiation that travels much faster than the speed of sound and actually at the speed of light
when a space rock plunges earthward, friction caused by the atmosphere creates a trail of electrically charged particles, or plasma, in which Earth's invisible but potent magnetic field lines become trapped, tangled and twisted like strings of cooked spaghetti. This magnetic spaghetti is thought to generate very low frequency radio waves, says Keay ... The waves are thought to travel at the speed of light and are converted into sound when they interact near the ground with what are called "dielectric media" or "transducers," which can be massive ordinary objects or electrical activity in the lower atmosphere.".
Radio waves are not sound waves, but they are still electromagnetic waves, situated on the low-frequency end of the light spectrum. Many objects in the universe, including stars and quasars, emit radio waves. Even our home galaxy, the Milky Way, emits a static hiss (first detected in 1931 by physicist Karl Jansky).
Other galaxies also send out a background radio hiss.But the newly detected signal, described here today at the 213th meeting of the American Astronomical Society, is far louder than astronomers expected. There is "something new and interesting going on in the universe," said Alan Kogut of NASA's Goddard Space Flight Center in Greenbelt, Md.
"The universe really threw us a curve," Kogut said. "Instead of the faint signal we hoped to find, here was this booming noise six times louder than anyone had predicted. "Detailed analysis of the signal ruled out primordial stars or any known radio sources, including gas in the outermost halo of our own galaxy.
Mystery Roar from Far-Away Space Detected
Other radio galaxies also can't account for the noise – there just aren't enough of them. "You'd have to pack them into the universe like sardines," said study team member Dale Fixsen of the University of Maryland. "There wouldn't be any space left between one galaxy and the next." The signal is measured to be six times brighter than the combined emission of all known radio sources in the universe. For now, the origin of the signal remains a mystery.
Every night for the past two months the noise resembling the hum of a car engine has seemingly moved through the air, flooding the entire town's population of 300 with the annoyingly undetectable sound. Sometimes it gets so strong it shakes beds. Sometimes it grows louder in different parts of the same home. But no matter how loud, it's entirely a mystery.