Charles Lindsey of the Solar Physics Research Corporation in Arizona and Douglas Braun of Northwest Research Associates in Colorado used data from a Doppler imager on the Solar Heliospheric Observatory (SOHO) to measure ripples on the surface of the Sun. In standard helioseismology measurements of the motion of the surface are used to reveal what is going on inside the Sun, just as standard seismology is used to learn more about the interior of the Earth. Lindsey and Braun used a technique called two-skip phase-sensitive holography to study the far side of the Sun. In addition to predicting space weather, the technique should lead to a better understanding of the acoustic properties of the Sun's magnetic regions and of the Sun as a whole.