Time Variations of Meridional and Zonal Flows

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Scientific paper

The so-called torsional oscillation, which manifests itself as bands of faster and slower rotation on top of the large-scale differential rotation, is well known. Initially it was discovered in surface Doppler shift observations, but it has since been seen using a variety of helioseismic techniques and in the rotation rate of the supergranulation. In this talk I will start by describing some of these measurements and show how it has been possible to detect the torsional oscillations to a significant depth. I will also discuss some of the other variations which have been detected in the solar rotation, in particular the 1.3 year oscillation near the solar tachocline. Finally I will discuss recent measurements of the meridional flow and its variations and what we may be able to learn in the near future.
This work was supported by NASA Grant NAG5-10483 to Stanford University.

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