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These are solar sounds generated from 40 days of Michelson Doppler Imager data
and processed by
A. Kosovichev.
The procedure he used for generating these sounds was the
following. He started with doppler velocity data, averaged over the
solar disk, so that only modes of low angular degree (l = 0, 1, 2)
remained. Subsequent processing removed the spacecraft motion
effects, instrument tuning, and some spurious points. Then Kosovichev
filtered the data at about 3 mHz to select clean sound waves (and not
supergranulation and instrumental noise). Finally, he interpolated
over the missing data and scaled the data (speeded it up a factor
42,000 to bring it into the audible human-hearing range (kHz)).