MessageToEagle.com - A new recording of an intriguing and well-known phenomenon known as “chorus,”
has been released by a team of scientists at the University of Iowa, working with the RBSP’s Electric and Magnetic Field Instrument Suite
and Integrated Science (EMFISIS).
The sound, which is perfectly audible to the human ear, originates from radio waves within Earth’s magnetosphere.
It was recorded by EMFISIS instrument on Sept. 5, 2012.
Audio of the phenomenon known as "chorus" radio waves within
Earth’s magnetosphere that are audible to the human ear, as recorded on Sept. 5, 2012, by RBSP’s Electric
and Magnetic Field Instrument Suite and Integrated Science (EMFISIS). Five six-second "events" are captured
in this sample, and they are played end-to-end, one right after the other, without gaps. Credit: University of Iowa
Illustration of RBSP spacecraft with instruments labeled. Credit: LMSAL
The Waves tri-axial search coil magnetometer and receiver of EMFISIS captured several notable peak radio wave
events in the magnetosphere that surrounds the Earth.
The radio waves, which are at frequencies that are audible to the human ear, are emitted by the energetic particles
in the Earth’s magnetosphere.
“People have known about chorus for decades,” says EMFISIS principal investigator Craig Kletzing, of the University
of Iowa.
“Radio receivers are used to pick it up, and it sounds a lot like birds chirping. It was often more easily picked up
in the mornings, which along with the chirping sound is why it’s sometimes referred to as ‘dawn chorus.’”
This recording was made by many members of the EMFISIS team, including Terry Averkamp, Dan Crawford, Larry Granroth,
George Hospodarsky, Bill Kurth, Jerry Needell and Chris Piker.
The EMFISIS investigation is a multi-instrument team composed of experimentalists and modellers at several institutions.
The lead institution is the University of Iowa which coordinates the entire investigation and also provides the hardware
for the Waves portion of the investigation including the tri-axial magnetic search coil sensors.
The tri-axial fluxgate magnetometer and associated electronics are provided by the Goddard Space Flight Center.
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