Abstract

The solar magnetic cycle leads to phenomena that affect society. We are not yet able to predict the solar cycle. The continuous helioseismic monitoring of the Sun since 1995 is allowing us to examine how the Sun changes on short time scales and knowledge of these changes should help in understanding the activity cycle. Helioseismic data have allowed us to determine how solar dynamics is changing. We are now beginning to be able to infer changes in solar structure too. In this talk, I will chronicle what we have determined thus far in terms of changes in solar structure and dynamics. I shall also dwell upon the questions that these results raise.