Back in November you might remember I
asked you for your comments on what space
sounds like, in particular what you think
you can hear when you listen to this.
Well now we've learned a little bit more
about what we these sounds actually are, as part of
my SSFX or Space Sound Effects
videos, I thought it was about time to dive into
those comments. First up though, a little
more technical detail about how I
produced these sound. The recordings have
been taken from NOAA and NASA's
Geostationary Operational Environment
Satellites or GOES. Now as the name
suggests these satellites are placed
in geostationary orbit, so they go around
the earth some 35,786 kilometers
above the equator meaning it takes them
exactly one day to complete a single
orbit and so from our point of view
here on Earth they just hover in the
same point in the sky. The GOES satellites
in fact sit just above America and
are mostly used for their weather
forecasts, but they also monitor the space
environment in various different ways.
Now while the satellites can't actually
measure sound directly, I've use the trick
mentioned before by taking measurements
in the magnetic field as a proxy for the
fluid waves in space. But to make these
sounds audible to us not only do we need
to amplify them from about -100dB
sound pressure level to something above
our healing threshold of +60, we also
need to change their frequency. The way
to do this is by squashing the data in
time... a lot! If you make a whole year last
just six minutes, then you can actually
hear these sounds from space. And once
you can do that you can try and pick out
the musical notes of the magnetosphere,
sounds triggered by the solar wind, and
all manner of other different things
that are happening in space
right around us all the time. So with
that in mind, let's have a look at those
comments. Now I've collated all of the
comments into this infographic and it
just goes to show the breadth of
different things people can hear in this
zoo of sounds from space. There were,
howeve,r a few common themes which I
would like to explore. One of the most
common comments was that there was the
sound of wind blowing into the
microphone or hitting an object like say
a canvas or a metal sheet. And you know
what, you're not wrong. These very loud
sounds seem to in general comes from
variations in the solar wind. That causes
the size of the magnetosphere to either
squash or expand in the process and
sends ripples, sound waves, throughout our
magnetosphere, which are then picked
up by the GOES satellites. So what you're
hearing there is in fact wind, it's just the
solar wind. The other most frequent
comment was that it sounded a lot like
things were zooming past. To get more
technical here, there are frequencies
which sweep from high to low which is
exactly what you hear when something
speeds passed you, it's the Doppler effect in
action. Unfortunately, that's not what
actually is going on here in this case.
Remember that the magnetosphere is
something like a massive musical
instrument, what's happening here is as
our satellite orbits around the earth
it's encountering magnetic field lines
which have different notes, just like as
you strum a guitar your finger triggers
the different notes of the different
strings. It just so happens that these
notes in the magnetosphere tend to go
from high to low frequency during that
orbit. So it was fooling into thinking
objects were whizzing by when in fact they
weren't. Another thing I saw quite a bit
of was people trying to attribute
scientific meaning to the sounds
given the small amounts of detail I actually
told you about them. It's funny that
armed with such little information we
try and make connections to interpret
these sounds, whereas maybe if we'd not
been told anything we might perceive
them in a different way. Human brains are
weird. OK let's get on to a few select
comments. CK says "from my perspective as a
human being it sounds like a bunch of
birds flapping their wings. However, I
must consider the fact that these might
be a sound that we humans are not
familiar with on earth. It might be a
language, a repeated message out of space".
Well CK, good to hear you're a human
being and not a bird, though I might have
been more interested if you were in fact
an alien. Now I'm no linguist, but I'm
pretty sure there aren't in fact any
alien messages being picked up here
otherwise someone at SETI probably
would have said something by now. But
maybe all we need is Amy Adams from Arrival
to crack the code. Sav Fruci reckons it
sounds like space debris whooshing and
crashing into something occasionally. Now
while there is huge amount of space
debris in orbit around the Earth and it's an
increasing problem for us who operate
satellites or even the International
Space Station, all that space junk that
exists around the Earth is far too
small to be producing these sounds.
Remember only things on very large
spatial and time scales can create or
support sound in space. But you should
check out Project Adrift because
they've created an electromechanical
sound instrument that tracks the
positions of 27,000 pieces of space
debris and transforms them into sound in
real time as they passed overhead. It's a
fascinating hybrid of science and art,
which is kind of what we're hoping for
with SSFX as well. OK Uke Bloke
thinks he can hear mini lightning
strikes and you know what, that might not
be as crazy as it sounds. Some recent
research suggests that there is a link
between what's happening in the solar
wind
to some lightning storms at least. So
whilst you're almost definitely not
actually hearing lightning hear, these
sounds may in fact be somehow related to
lightning in some circumstances. Pretty
cool right? Beast 1951 writes, "it sounds
like an octopus complaining to a
porpoise" I bet they're having a whale of a
time. And finally Couchpot asks "the
Earth is surrounded by dubstep?". Does this
really sound like dubstep to you?
yeah I guess it does. Thanks very much for all
your comments on the sounds, they have
been really interesting and in fact
helpful for the whole SSFX project.
Make sure you subscribe to the channel
for more space sound and physics stuff.
Cheers!
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