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scientists listen to the sun in new sonification project

ANN ARBOR, Mich.— Scientists can now listen to a set of solar wind data that?s usually represented visually, as numbers or graphs. University of Michigan researchers have ?sonified? the data. They?ve created an acoustic, or musical, representation of it.

The researchers? primary goal was to try to hear information that their eyes might have missed in solar wind speed and particle density data gathered by NASA?s Advanced Composition Explorer satellite. The solar wind is a stream of charged particles emanating from the sun.

The process of sonification isn?t new. It?s how Geiger counter radiation detectors emit clicks in the presence of high-energy particles.

?What makes this project different is the level of artistic license I was given,? said composer and recent U-M School of Music alumnus Robert Alexander.

The product, which Alexander says is ?in between art and science,? sounds appropriately primal and otherworldly. In one version, Alexander used what he describes as a tribal drum beat to represent the rotation of the sun, and he layered the voice of a singer (his sister) to represent the charge state of carbon atoms, for example.

?Every piece of scientific data tells a story. I'm expressing this story through music,? Alexander said. ?These sonifications present scientific data in a way that is immediately visceral.?

The solar wind fills the solar system and interacts with the planets, said Jason Gilbert, a research fellow in the Department of Atmospheric, Oceanic and Space Sciences. On Earth, solar storms can disrupt power on the ground and on satellites. Scientists study it in part to improve their predictions about how it will behave.

?In this sonification, we can actually hear in the data when the temperature goes up, or when the density increases,? Gilbert said.

While the researchers didn?t detect new information in this initial experiment, they see possibilities. ?I am excited for sonification?s potential in research, but I think more work will need to be done to realize that potential,? said Jim Raines, research computer specialist with the Department of Atmospheric, Oceanic and Space Sciences.

Thomas Zurbuchen, an associate dean in engineering and an atmospheric science professor, is proud of these initial results. (The sonification project was his idea.)

?To me, this project exemplifies what U-M is about: creativity reaching seamlessly across many fields to create something new,? Zurbuchen said.

Michigan Engineering:
The University of Michigan College of Engineering is ranked among the top engineering schools in the country. At $160 million, its engineering research budget is one of largest of any public university. Michigan Engineering is home to 11 academic departments and a National Science Foundation Engineering Research Center. The college plays a leading role in the Michigan Memorial Phoenix Energy Institute and hosts the world class Lurie Nanofabrication Facility. Find out more at
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Solar and Heliospheric Research Group:
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Full sonificationSolar and Heliospheric Research GroupRobert Alexander