NASA Latest Sun Sonification (raw audio)

These are solar sounds generated from 40 days of the Solar and Heliospheric Observatory’s (SOHO) Michelson Doppler Imager (MDI) data and processed by A. Kosovichev.

He followed the following steps to create these sounds. To begin, he used doppler velocity data that had been averaged over the solar disc, leaving only modes with low angular degrees (l = 0, 1, 2). Later processing eliminated several false spots, instrument tuning, and spacecraft motion effects. Then, Kosovichev used a 3 mHz filter to isolate pure sound waves from instrument noise and supergranulation. Finally, he scaled the data (sped it up by a factor of 42,000 to get it within the audible human-hearing range (kHz)) and interpolated over the missing data.