Invited_talk abstract details

The parameters describing global acoustic modes such as frequency, width, and amplitude clearly vary with the solar cycle sensing the local distribution of the surface magnetic activity. The frequency variation of the global modes provides information about the solar structure and the rotation rate in the solar interior. The rotation rate throughout the convection zone varies with the solar cycle.The so-called torsional oscillations consists of bands of faster- and slower-than-average zonal flows moving from mid-latitude toward the equator during the solar cycle. With local helioseismology techniques, it is possible to measure the flow component in the meridional direction in addition to the one in the zonal direction and to determine the north-south asymmetries of the flow components. The variation of the meridional flow with depth and solar cycle can provide insights into the operation of the solar dynamo.