(One hertz is equal to one vibration per second).
To be able to hear them, scientists have sped up the waves 42,000 times -- and compressed 40 days of vibrations into a few seconds. It does not actually make noise out in space. However, when the vibration enters our atmosphere, it produces a frequency that we can hear. Listening to this sound can inspire a deep vibration within us – it has been said that this behind the ancient Hindu mantra, “OM.”
To listen to the sound of the Sun as recorded by NASA, check out this You Tube link:
https://www.youtube.com/watch?v=ZZQcLJjpdrI (It runs just over six minutes)
The sound of the Sun has been used to restructure water and found to work very well. (See website: liveleak.com in footnote below).[i]
"The Sun is playing a secret melody, hidden inside itself, that produces a widespread throbbing motion of its surface. The sounds are coursing through the Sun's interior, causing the entire globe, or parts of it, to move in and out, slowly and rhythmically like the regular rise and fall of tides in a bay or of a beating heart." (Kenneth R. Lang)[ii]
The technical stuff:
Astronomers at Stanford University can record acoustical pressure waves in the Sun by carefully tracking movements on the Sun's surface. To do this, they use an instrument called a Michelson Doppler Imager (MDI), mounted on the SOHO spacecraft, circling the Sun a million miles from Earth. The Solar Oscillations Investigation (SOI) uses the Michelson Doppler Imager (MDI), one of twelve Solar and Heliospheric Observatory (SOHO) instruments. MDI has the highest spatial resolution of the three helioseismology instruments on SOHO. SOI/MDI probes the interior of the Sun by measuring the photospheric manifestations of solar oscillations.
[ii] Quote taken from: http://solar-center.stanford.edu/singing/