Acoustic daylight imaging via spectral factorization: Helioseismology and reservoir monitoring

The earth and the sun both have a noisy surface and seismic velocity that increases with depth. Acoustic noise generates some waves that dive into the sphere and emerge at all distances. A process that we call acoustic daylight imaging enables us to form pictures of the interior. (Note: The term acoustic daylight imaging is used in oceanography but refers to a different concept.)