Elliot Kim
The Sun does make noise, but it is not audible to human ears. The Sun's noise is caused by its constant flow of hot material on the surface and the sinking of cooled material toward its center. Scientists have recorded these acoustical pressure waves using an instrument called the Michelson Doppler Imager, which is mounted on the SOHO spacecraft that circulates the Sun. After processing and speeding up the recording, the Sun's noise has been described as screaming sirens and a dull roar. If the Sun's sound could be heard on Earth, it would be around 100 decibels, which is similar to the volume of a rock concert.
| Characteristics | Values |
|---|---|
| Sound | The Sun does make a sound |
| Sound description | A low, pulsing hum, like screaming sirens |
| Sound volume | 10 to 100 times the power of speakers at a rock concert |
| Sound frequency | Too low for the human ear to hear |
| Sound speed | 42,000 times faster than the original recording |
| Sound recording equipment | Michelson Doppler Imager |
| Sound recording location | SOHO spacecraft, approximately 1 million miles from Earth |
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What You'll Learn
Sound waves and the vacuum of space
Sound is carried through vibrations in the air or another medium. In the vacuum of space, there is no air, and therefore, sound waves cannot be transmitted. However, this does not mean that there is no sound in space.
Sound waves can travel through solids, liquids, and gases, and in space, there are solid objects like planets and asteroids, as well as liquids and gases in smaller quantities. So, while sound cannot travel through the vacuum of space, it can exist and be transmitted through these solid, liquid, and gaseous mediums.
The Sun, for example, produces sound. Solar physicists from Stanford University recorded acoustical pressure waves using an instrument called the Michelson Doppler Imager. This instrument is mounted on the SOHO spacecraft, which orbits the Sun, and it recorded the noise on the solar surface. The Sun's noise is caused by its constant flow of hot material on the surface and the sinking of cooled material toward its center. On the surface, this noise is estimated to be 10 to 100 times the power of speakers at a rock concert. If these sound waves could pass through space, they would still be around 100 decibels by the time they reached Earth. However, the waves emitted are at frequencies too low for the human ear to hear.
Scientists have sped up and compressed these sound waves to make them audible to humans. The result is a sound described as "'screaming sirens,'" and it has been said that these sounds would deafen every human on Earth. While the Sun does produce sound, it is fortunate that we cannot hear it on Earth, as it would be a constant, deafening noise.
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Recording the sun's sound
The procedure for generating these sounds started with Doppler velocity data, averaged over the solar disk, so that only modes of low angular degree remained. Subsequent processing removed spacecraft motion effects, instrument tuning, and some spurious points. Kosovichev, from the Stanford Experimental Physics Lab, then filtered the data at about 3 mHz to select clean sound waves. Finally, he interpolated over the missing data and scaled it up 42,000 times to bring it into the audible human-hearing range.
The sound of the sun has been described as ""screaming sirens" and a "dull roar". If we were able to hear the sun, it would be like a perpetual rock concert, with a volume of around 100 decibels during the day. At night, as we turn away from the sun, the roar would fade, and we might even be able to hold conversations.
The sun's sound is on display at the NASA Goddard Visitor Center in Greenbelt, Maryland, through an immersive art installation called Solarium. This installation uses vivid imagery and sonification to give listeners an experience of being at the heart of our solar system.
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The sun's sound as screaming sirens
The Sun's movement creates sound, including waves, loops, and eruptions. However, because there is no air in space, sound does not travel through it. Even if sound could travel through space, the waves would not make it out of the Sun's corona or atmosphere. Instead, they would implode as shock waves and dissolve into heat.
Scientists have been able to record the Sun's sound using special equipment. Solar physicists from Stanford University recorded acoustical pressure waves using an instrument called the Michelson Doppler Imager. This imager is mounted on the SOHPO spacecraft, which circles the Sun and is approximately one million miles from Earth. The noise on the Sun's surface is estimated to be 10 to 100 times the power of speakers at a rock concert. If the sounds could pass through space, they would still be 100 decibels by the time they reached Earth.
To make the Sun's sound audible to humans, scientists had to speed up the recording by 42,000 times. The resulting sound has been described as "'screaming sirens' that would deafen every human on Earth. The Sun's sound has also been likened to a dull roar, similar to Niagara Falls, which clocks in at around 90 decibels.
While the Sun's sound may be unpleasant or uninteresting to humans, it is useful to scientists. By studying the Sun's natural vibrations, scientists can learn about its internal dynamics and complex motions, such as solar flares and coronal mass ejections. This information helps us better understand the layers and composition of our star.
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Studying the sun's movement
The study of the Sun and its influence throughout the solar system is called heliophysics. The Sun is a G-type main-sequence star, a hot glowing ball of hydrogen and helium, that makes up about 99.86% of the mass of the solar system. It is the largest object in our solar system, with a diameter of about 865,000 miles (1.4 million kilometres), and its gravity holds the solar system together.
The Sun formed about 4.6 billion years ago from the collapse of part of a giant molecular cloud that consisted mostly of hydrogen and helium. This age is estimated using computer models of stellar evolution and through nucleocosmochronology. The Sun's motion around the barycentre approximately repeats every 179 years, rotated by about 30°, due primarily to the synodic period of Jupiter and Saturn. This motion is mainly due to Jupiter, Saturn, Uranus, and Neptune.
The Sun takes a full 24 hours to make a complete circle around the celestial sphere, instead of just 23 hours and 56 minutes. The exact position of the Sun in the sky depends on the time and the geographic location of observation on Earth's surface. As Earth orbits the Sun over the course of a year, the Sun appears to move with respect to the fixed stars on the celestial sphere, along a circular path called the ecliptic. The Sun appears to move along with the celestial sphere on any given day, but follows different circles at different times of the year: most northerly at the June solstice and most southerly at the December solstice.
The Sun's movement has been observed and studied by various ancient cultures and scientists throughout history. In the early 1st millennium BC, Babylonian astronomers observed that the Sun's motion along the ecliptic is not uniform. In 1666, Isaac Newton observed the Sun's light using a prism, and in 1800, William Herschel discovered infrared radiation beyond the red part of the solar spectrum. The 19th century saw advancements in spectroscopic studies of the Sun, with Joseph von Fraunhofer recording more than 600 absorption lines in the spectrum.
Today, several spacecraft are currently investigating the Sun, including the Parker Solar Probe, STEREO, Solar Orbiter, SOHO, Solar Dynamics Observatory, Hinode, IRIS, and Wind.
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The sun's sound as white noise
The Sun does indeed produce sound, and it is incredibly loud. Due to the absence of air in space, sound cannot travel through it, so we are fortunate that we cannot hear the Sun on Earth. However, scientists have been able to record the Sun's sound using special equipment, and it resembles white noise or "screaming sirens".
Solar physicists from Stanford University used an instrument called the Michelson Doppler Imager, mounted on the SOHO spacecraft, to record the acoustical pressure waves on the Sun's surface. The Sun's noise is caused by the constant flow of hot material on its surface and the sinking of cooled material toward its center. These sounds are estimated to be 10 to 100 times the power of speakers at a rock concert. If these sounds could pass through space, they would still be around 100 decibels by the time they reached Earth.
To make the Sun's sounds audible to humans, scientists had to speed up the audio by 42,000 times and compress it into a file a little over a minute long. The resulting sound is like a dull roar, similar to standing next to Niagara Falls, which clocks in at around 90 decibels.
The Sun's sound is not just noise, however. Scientists can use these vibrations to study complex motions inside the Sun, such as solar flares and coronal mass ejections. By capturing the dynamic movement of the Sun's atmosphere, scientists can peer inside, visualizing rivers of solar material flowing around. This technique of sonification allows for a unique way to study the Sun when traditional observation methods fall short.
The Sun's sounds can be heard at the NASA Goddard Visitor Center in Greenbelt, Maryland, where an immersive art installation called Solarium uses vivid imagery and sonification to give listeners an experience of being at the heart of our solar system.
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Frequently asked questions
Yes, the Sun does make a sound. NASA has captured the Sun's natural vibrations and dynamic movements, which provide scientists with a representation of its internal activity.
The Sun has been described as sounding like "screaming sirens". Scientists from Stanford University recorded acoustical pressure waves using the Michelson Doppler Imager, which is mounted on the SOHO spacecraft. The sound on the surface of the Sun is estimated to be 10 to 100 times the power of speakers at a rock concert.
No, humans cannot hear the sound of the Sun. The frequencies emitted are too low for the human ear to detect. Additionally, sound cannot travel through the vacuum of space; it would need a medium like air to transmit the sound.
