Some current problems in helioseismology

Helioseismology is enjoying a tremendous surge of activity, spurred by the combination of reliable data and effective interpretation methods. This review describes two current topics in helioseismology. Several workers have now made measurements relating to the variation of rotation with depth and latitude inside the Sun. Most of the observations agree fairly well on the depth dependence, but not so well on the latitude dependence. The author explains how such measurements are made, and discuss the current state of this controversy. The driving mechanism for solar p-modes remains a mystery. The best (in the author's view) explanation involves stochastic driving of the modes by turbulent convection. This theory has recently been extended in a way that illuminates some issues and obscures others. The author attempts to proved a simple introduction to these ideas