How the European Space Agency turned five years of wind data into an orchestra
When the Aeolus satellite completed its mission, the European Space Agency transformed its entire lifetime of orbital data into a thirty-minute orchestral piece. By mapping complex wind measurements to specific instruments, composers created a sonic time capsule that captures everything from global weather patterns to the COVID-19 pandemic.
Launched in August 2018, the Aeolus satellite was a pioneering Earth Explorer mission designed to profile global winds from space. Its primary instrument, the Aladin laser, required two decades of development to overcome significant engineering challenges. Despite its research-focused origins, the satellite exceeded expectations, providing high-quality, near-realtime data that meteorological centers began using for weather forecasting as early as 2020.
To commemorate the mission's conclusion in 2023, ESA collaborated with composer Jamie Perera to create 'Life of Aeolus.' This orchestral work functions as a data-driven narrative, where each second of the thirty-minute composition represents one day of the satellite's life. Perera worked with data specialists to aggregate mission-long measurements, mapping variables like wind velocity, air pressure, and cloud density to the ranges of various woodwind instruments. For instance, the piccolo represents the tops of clouds illuminated by the laser, while the bassoon and bass clarinet track the beams as they reach toward Earth's surface.
The piece also incorporates landmark events that occurred while the satellite orbited the globe sixteen times a day. Volcanic eruptions are represented by drums, hurricanes by synthetic wind effects, and the COVID-19 pandemic by a pulsing synthesizer rhythm. By choosing the Lydian mode in B-flat, the creators aimed for an expansive, pioneering aesthetic. Beyond its artistic merit, the project serves as a multidisciplinary tool for knowledge creation, offering an accessible way for visually impaired audiences to interact with complex scientific data.
Following its successful mission, Aeolus performed a controlled reentry in July 2023. This first-of-its-kind operation saw the satellite descend back into the atmosphere, where approximately 80% was expected to burn up, with the remainder splashing down in the Atlantic Ocean. The resulting sonification remains a permanent record of the satellite's contribution to climate science and meteorology.
Source: Sonification of Aeolus
