NASA's Magnetospheric Multiscale satellites have detected chorus waves, bursts of plasma that produce sound-like frequencies, at a record distance of over 62,000 miles from Earth. These findings raise new questions about the physics governing these waves and their formation in extended regions of Earth's magnetic field.
The latest notes were picked up by NASA’s Magnetospheric Multiscale satellites, pictured in Titusville, Fla., launched in 2015 to explore the Earth and sun’s magnetic fields.These bursts of plasma, called chorus waves , ripple at the same frequency as human hearing. When converted to audio signals, their sharp notes mimic high-pitched bird calls.
“That opens up a lot of new questions about the physics that could be possible in this area,” said Allison Jaynes, a space physicist at the University of Iowa who was not involved with the work. The chorus has been picked up on radio antennas for decades, including receivers at an Antarctica research station in the 1960s. And twin spacecraft – NASA’s Van Allen Probes – heard the chirps from Earth’s radiation belts at a closer distance than the newest detection.
Chorus waves have also been spotted near other planets including Jupiter and Saturn. They can even produce high-energy electrons capable of scrambling satellite communications.
Space Waves Chorus Waves Earth's Magnetic Field Satellite Observations Plasma Physics
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