Theory of Solar Oscillations

This paper reviews some of the most recent analyses of helioseismological data, and discusses briefly some theoretical issues they raise. The properties of resonant modes of oscillation are briefly reviewed, for the purpose of subsequently understanding what aspects of the solar structure can be measured from their frequencies. A recent determination of the variation of sound speed through much of the interior of the sun is then described. The measurement reveals the presence of macroscopic motion in the solar core.