SpaceSounds

UPDATE (20 Aug 2015): What made the comet sing? Scientists working on Rosetta's RPC instrument have found out why 67P/C-G was singing. Via http://wp.me/p46DHN-1nN
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ORIGINAL Citation (Oct 2014): Rosetta’s Plasma Consortium (RPC) has uncovered a mysterious ‘song’ that Comet 67P/Churyumov-Gerasimenko is singing into space. The comet seems to be emitting a ‘song’ in the form of oscillations in the magnetic field in the comet’s environment. It is being sung at 40-50 millihertz, far below human hearing, which typically picks up sound between 20 Hz and 20 kHz. To make the music audible to the human ear, the frequencies have been increased in this recording. This sonification of the RPC-Mag data was compiled by German composer Manuel Senfft (www.tagirijus.de).  Read full details in ESA's Rosetta blog: http://wp.me/p46DHN-Li 

Copyright Notice

Original Data Credit: ESA/Rosetta/RPC/RPC-MAG
Sonification: TU Braunschweig/IGEP/Manuel Senfft, CC-BY-NC-SA 4.0 http://creativecommons.org/licenses/by-nc-sa/4.0/

Thumbnail image credit: ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0

A Singing Comet

Philae’s SESAME-CASSE instrument ‘listened’ to the lander’s MUPUS instrument hammer the surface of Comet 67P/Churyumov-Gerasimenko last November. 

Note: Access full description of this audio file via:
http://blogs.esa.int/rosetta/2015/11/12/the-sound-of-philae-conducting-science/

** SESAME-CASSE is the Cometary Acoustic Sounding Surface Experiment located in the lander’s feet in the form of three accelerometers, each of which records acceleration in three directions (one vertical and two horizontal)

** MUPUS comprises the Multi-Purpose Sensors for Surface and Subsurface Science – including the MUPUS penetrator that was activated towards the end of Philae’s first science sequence on 14 November 2014

It was recognized early in the preparation of both experiments that the hammering mechanism of MUPUS, which drives a thermal probe into the comet’s surface, would serve as an acoustic source for sounding the subsurface with CASSE. The determination of the propagation velocity of sound would allow scientists to look at possible layering in the comet’s surface/subsurface materials, important for understanding its evolution.

The CASSE instrument listened to the hammering of MUPUS for 2 hours and 15 minutes. Due to memory limitations, CASSE was not able to take continuous recordings, but only recorded a few seconds in one go. 

A total of 15 hammer strokes were recorded; this audio file contains two signals. The time between the two strokes fits to the charge time of the hammer mechanism expected at that time, thus this particular recording proves that CASSE was really recording hammer strokes.

When recorded, the Philae lander and the comet were about 510 million kilometres from Earth.

Credit: ESA/Rosetta/Philae/SESAME/DLR (CC BY-SA IGO 3.0) 

The sound of Philae conducting science - 1

Philae’s SESAME-CASSE instrument ‘listened’ to the lander’s MUPUS instrument hammer the surface of Comet 67P/Churyumov-Gerasimenko last November.

Note: Access full description of this audio file via:
http://blogs.esa.int/rosetta/2015/11/12/the-sound-of-philae-conducting-science/

** SESAME-CASSE is the Cometary Acoustic Sounding Surface Experiment located in the lander’s feet in the form of three accelerometers, each of which records acceleration in three directions (one vertical and two horizontal)

** MUPUS comprises the Multi-Purpose Sensors for Surface and Subsurface Science – including the MUPUS penetrator that was activated towards the end of Philae’s first science sequence on 14 November 2014

It was recognized early in the preparation of both experiments that the hammering mechanism of MUPUS, which drives a thermal probe into the comet’s surface, would serve as an acoustic source for sounding the subsurface with CASSE. The determination of the propagation velocity of sound would allow scientists to look at possible layering in the comet’s surface/subsurface materials, important for understanding its evolution.

The CASSE instrument listened to the hammering of MUPUS for 2 hours and 15 minutes. Due to memory limitations, CASSE was not able to take continuous recordings, but only recorded a few seconds in one go.

A total of 15 hammer strokes were recorded. This file contains hammer stroke no. 129 (as determined from the MUPUS housekeeping catalogue), which was recorded on Philae’s +Y foot.

This stroke was executed at the highest energy level of the hammer system. All three channels of the +Y foot are mixed into the sound file, which is presented at real playback speed, in stereo. The signals on the other two feet were, in this case, much weaker and their recordings would mainly add to the background noise.

When recorded, the Philae lander and the comet were about 510 million kilometres from Earth.

ESA/Rosetta/Philae/SESAME/DLR (CC BY-SA IGO 3.0) 

SpaceSounds

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