On February 24 the gringa posted “Moon Music – It’s Classified” with an interesting audio recording from the Apollo 10 mission in 1969. Today I would like to share a great video posted by NASA entitled “NASA Space Sounds”. Although there is an eeriness to the multi-planet ensemble, the gringa finds the sounds to have a meditative quality.
Now, the gringa wants to know how music and sound is produced in outer space. Sound is a vibration that travels through air. In order for vibrations to travel through outer space molecules have to exist in outer space. It is the vibrating air molecules that produce the sound. Outer space is a vacuum, meaning that in the area between planets and stars, there are no molecules. So how is this space music produced?
These symphonies are, indeed, vibrating wave patterns. Planets and moons emit electromagnetic pulses that bounce back and forth between surrounding rings and atmospheric barriers that are not visible to the naked eye. The charged particles within these atmospheres, plasma, are the “carriers” of the sound.
To capture these sounds NASA uses space probes equipped with plasma wave antennae. One particular NASA spacecraft featuring a plasma wave antenna is Voyager. This craft also has on board “The Golden Record” which shares images and sounds from Earth. So, Voyager is on an interactive sound mission, capturing and sharing.
Other things Voyager has captured are “tsunami solar waves”. When there is a burst of energy from the sun, a solar flare, a plasma shockwave is created. It takes about one year for the shockwave to reach Voyager and have the sound recorded. NASA has three recordings thus far.
Shock waves from the sun, as well as cosmic rays from other nearby stars within our Milky Way galaxy, are filled with plasma particles. Plasma is dense and creates very rapid oscillations when something causes the particles to vibrate. A plasma “bubble”, also called a “bell”, surrounds stars like our sun. When a solar flare occurs it’s like ringing a bell. A plasma shockwave resonates. March, 2014 was the third recording by Voyager 1 of our singing Sun.
Plasma is very interesting. It is filled with charged particles. It’s kind of like space soup that has the potential to sing. So the Voyager spacecrafts are basically recording singing space soup. Space soup is also called interstellar space. This is the area of space that exists between stars and contains plasma.
The Voyager mission launched in 1977 with two Voyager spacecraft. Voyager 2 launched about two weeks earlier than Voyager 1 and is still on the job making it the longest operating spacecraft in history. Both Voyagers have visited Jupiter and Saturn. #2 did a fly-by of Uranus and Neptune. One thing they have taught us in their travels is that space is a noisy and musical place thanks to plasma.
Source & Image Credit: http://www.nasa.gov