Helioseismology is the study of the propagation of wave oscillations, particularly acoustic pressure waves, in the Sun. Unlike seismic waves on Earth, solar waves have practically no shear component (s-waves). Solar pressure waves are believed to be generated by the turbulence in the convection zone near the surface of the sun. Certain frequencies...
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http://en.wikipedia.org/wiki/Helioseismology
study of sun's interior by observing its surface oscillations
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http://phrontistery.info/h.html
(from the article `Sun`)
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http://www.britannica.com/eb/a-z/h/33
The study of the Sun`s interior by measuring oscillations of the surface caused by sound waves that travel through the Sun at different depths. Large numbers of distinct, resonating sound waves can be detected by the Doppler shift they cause in spectral lines emitted at the Sun's surface. The period...
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http://www.daviddarling.info/encyclopedia/H/helioseismology.html
helioseismology 1. The study of sun quakes by observing the structure, composition, and dynamics of the sun from indirect observations of acoustic waves on the sun's surface. 2. The study of the sun's internal structure using observations of the frequencies and strengths of normal mode oscillations detected at the surface by their Doppler shifts. ...
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