“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) (Astrophysicist)
Scientists from the Ulysses mission have proven that sounds generated deep inside the Sun cause the Earth to shake and vibrate in sympathy. They have found that Earth’s magnetic field, atmosphere and terrestrial systems, all take part in this cosmic sing-along.
(David) Thomson ( team member of HISCALE experiment aboard Ullyses) believes that the key to the problem is magnetism. He suggests that the g-mode vibrations are picked up by the magnetic field at the Sun’s surface. Part of this magnetic field is then carried away from Sun into interplanetary space by solar wind, where it can be detected by space probes like Ulysses.
The magnetic field of the solar wind in turn interacts with the Earth’s magnetic field and causes it to vibrate in sympathy, retaining the characteristic g-mode signals. The motions of the geomagnetic field then couple into the solid Earth to produce small, but easily detectable, responses as Earth, with many of its technological systems, moves to the rhythm of the Sun.
The Sun’s acoustical waves bounce from one side of the Sun to the other in about two hours, causing the Sun’s surface to oscillate, or wiggle up and down. Because these sound waves travel underneath the Sun’s surface, they are influenced by conditions inside the Sun. So scientists can use the oscillations to learn more about how the structure of the Sun’s interior shapes its surface.
The Sun’s sound waves are normally at frequencies too low for the human ear to hear. To be able to hear them, the scientists sped up the waves 42,000 times — and compressed 40 days of vibrations into a few seconds. What you’ll hear (in recordings) are just a few dozen of the 10 million resonances echoing inside the Sun.