Pay special attention to the last paragraph. I have NOT checked this
item for accuracy or authenticity -it was sent to me by a friend.
Earth's Cries Recorded in Space
Robert Roy Britt
Senior Science Writer
SPACE.comTue Jul 1, 12:33 AM ET
Earth emits an ear-piercing series of chirps and whistles that could
be heard by any aliens who might be listening, astronomers have
The sound is awful, a new recording from space reveals.
Scientists have known about the radiation since the 1970s. It is
created high above the planet, where charged particles from the solar
wind collide with Earth's magnetic field. It is related to the
phenomenon that generates the colorful aurora, or Northern Lights.
The radio waves are blocked by the ionosphere, a charged layer atop
our atmosphere, so they do not reach Earth. That's good, because the
out-of-this-world radio waves are 10,000 times stronger than even the
strongest military signal, the researchers said, and they would
overwhelm all radio stations on the planet.
Theorists had long figured the radio waves, which were not well
studied, oozed into space in an ever-widening cone, like light from a
But new data from the European Space Agency's Cluster mission, a
group of four high-flying satellites, reveals the bursts of radio
waves head off to the cosmos in beam-like fashion, instead.
This means they're more detectable to anyone who might be listening.
The Auroral Kilometric Radiation (AKR), as it is called, is beamed
out in a narrow plane, as if someone had put a mask over a torch and
left a slit for the radiation to escape.
This flat beam could be detected by aliens who've figured this
process out, the researchers say. The knowledge could also be used by
Earth's astronomers to detect planets around other stars, if they can
build a new radio telescope big enough for the search. They could
also learn more about Jupiter and Saturn by studying AKR, which
should emit from the auroral activity on those worlds, too.
"Whenever you have aurora, you get AKR," said Robert Mutel, a
University of Iowa researcher involved in the work.
The AKR bursts -- Mutel and colleagues studied 12,000 of them --
originate in spots the size of a large city a few thousand miles
above Earth and above the region where the Northern Lights form.
"We can now determine exactly where the emission is coming from,"
Our planet is also known to hum, a mysterious low-frequency sound
thought to be caused by the churning ocean or the roiling atmosphere.