Temporal Variations of the Rotation Rate in the Solar Interior

The temporal variations of the rotation rate in the solar interior are studied using frequency splittings from Global Oscillations Network Group (GONG) data obtained during the period 1995-1999. We find alternating latitudinal bands of faster and slower rotation that appear to move toward the equator with time—similar to the torsional oscillations seen at the solar surface. This flow pattern appears to persist to a depth of about 0.1 R ☉ , and in this region its magnitude is well correlated with solar activity indices. We do not find any periodic or systematic changes in the rotation rate near the base of the convection zone.