Sun's Atmosphere Sings

Astronomers
have recorded heavenly music bellowed out by the Sun's atmosphere.
Snagging
orchestra seats for this solar symphony would be fruitless, however, as the frequency
of the sound waves is below the human hearing threshold. While humans can make
out sounds between 20 and 20,000 hertz, the solar sound waves are on the order
of milli-hertz—a thousandth of a hertz.
The study,
presented this week at the Royal Astronomical Society's National Astronomy
Meeting in Lancashire, England, reveals that the looping
magnetic fields along the Sun's outer regions, called the corona, carry
magnetic sound waves in a similar manner to musical instruments such as guitars
or pipe organs.
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