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• The tachocline is the interface between the rigidly-rotating radiative zone and the differentially rotating convective zone

• The tachocline is suprisingly thin: only about 5% of the solar radius.

• The tachocline is significantly prolate: found at 0.69 R at the equator, 0.72 R at 60° latitude.

• Rotation rate roughly 65% of surface rotation

• Possibly the source of magnetic flux tubes which permeate the surface (i.e. sunspots).